diff --git a/Cargo.lock b/Cargo.lock
index 0b4e386bae5..6107dee327b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3918,7 +3918,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-aggregator"
-version = "0.7.74"
+version = "0.7.75"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -3999,7 +3999,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-api-spec"
-version = "0.1.1"
+version = "0.1.2"
 dependencies = [
  "jsonschema",
  "mithril-common",
@@ -4021,7 +4021,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-cardano-node-chain"
-version = "0.1.4"
+version = "0.1.5"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -4080,7 +4080,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-client"
-version = "0.12.22"
+version = "0.12.23"
 dependencies = [
  "anyhow",
  "async-recursion",
@@ -4118,7 +4118,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-client-cli"
-version = "0.12.22"
+version = "0.12.23"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -4170,7 +4170,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-common"
-version = "0.6.9"
+version = "0.6.10"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -4212,7 +4212,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-dmq"
-version = "0.1.4"
+version = "0.1.5"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -4271,7 +4271,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-era"
-version = "0.1.2"
+version = "0.1.3"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -4320,7 +4320,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-relay"
-version = "0.1.47"
+version = "0.1.48"
 dependencies = [
  "anyhow",
  "clap",
@@ -4364,7 +4364,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-signed-entity-preloader"
-version = "0.0.7"
+version = "0.0.8"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -4380,7 +4380,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-signer"
-version = "0.2.260"
+version = "0.2.261"
 dependencies = [
  "anyhow",
  "async-trait",
diff --git a/DEV-ADR.md b/DEV-ADR.md
index 455bf0b9526..ccbd48d9eb9 100644
--- a/DEV-ADR.md
+++ b/DEV-ADR.md
@@ -23,6 +23,34 @@ To complete
 To complete
 -->
 
+### 3. Guidelines for Dummy Test Doubles
+
+**Date:** 2025-07-22
+**Status:** Accepted
+
+#### Context
+
+The use of `dummy()` functions for creating test doubles is widespread across the codebase. However, inconsistencies
+in their placement and visibility have led to maintenance challenges and reduced code clarity.
+
+#### Decision
+
+A `Dummy` trait will be introduced, functioning similarly to Rust's `Default` trait.
+
+The following guidelines will be adopted for implementing the `Dummy` trait:
+
+1. Most implementations should reside in a `test::double::dummies` module within the crate where the type is defined.
+2. For types with non-public fields, the `Dummy` trait should be implemented directly below the type's definition.
+
+#### Consequences
+
+- Enhanced consistency in code organization.
+- Improved discoverability of test doubles.
+- Clearer distinction between production and test code.
+- Simplified maintenance of test implementations.
+
+---
+
 ## 2. Remove Artifacts serialization support when compiling to WebAssembly
 
 date: 2025-02-26
diff --git a/internal/cardano-node/mithril-cardano-node-chain/Cargo.toml b/internal/cardano-node/mithril-cardano-node-chain/Cargo.toml
index 9511916d7ea..2f1ea563933 100644
--- a/internal/cardano-node/mithril-cardano-node-chain/Cargo.toml
+++ b/internal/cardano-node/mithril-cardano-node-chain/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-cardano-node-chain"
-version = "0.1.4"
+version = "0.1.5"
 authors.workspace = true
 documentation.workspace = true
 edition.workspace = true
diff --git a/internal/cardano-node/mithril-cardano-node-chain/src/test/double/chain_observer.rs b/internal/cardano-node/mithril-cardano-node-chain/src/test/double/chain_observer.rs
index 00285b9a06e..0c671a5bc5e 100644
--- a/internal/cardano-node/mithril-cardano-node-chain/src/test/double/chain_observer.rs
+++ b/internal/cardano-node/mithril-cardano-node-chain/src/test/double/chain_observer.rs
@@ -212,7 +212,7 @@ impl ChainObserver for FakeChainObserver {
 
 #[cfg(test)]
 mod tests {
-    use mithril_common::test_utils::fake_data;
+    use mithril_common::test_utils::{double::Dummy, fake_data};
 
     use super::*;
 
diff --git a/internal/mithril-dmq/Cargo.toml b/internal/mithril-dmq/Cargo.toml
index 86b7036a5af..e660b212852 100644
--- a/internal/mithril-dmq/Cargo.toml
+++ b/internal/mithril-dmq/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "mithril-dmq"
 description = "Mechanisms to publish and consume messages of a 'Decentralized Message Queue network' through a DMQ node"
-version = "0.1.4"
+version = "0.1.5"
 authors.workspace = true
 documentation.workspace = true
 edition.workspace = true
diff --git a/internal/mithril-dmq/src/message.rs b/internal/mithril-dmq/src/message.rs
index e0c8021e259..08de36ae2c0 100644
--- a/internal/mithril-dmq/src/message.rs
+++ b/internal/mithril-dmq/src/message.rs
@@ -94,6 +94,7 @@ mod tests {
     use mithril_common::{
         crypto_helper::{KesSignerFake, TryToBytes},
         entities::{BlockNumber, ChainPoint, TimePoint},
+        test_utils::double::Dummy,
     };
 
     use super::*;
diff --git a/internal/mithril-dmq/src/publisher/pallas.rs b/internal/mithril-dmq/src/publisher/pallas.rs
index 4cae2ae4984..55f8329584b 100644
--- a/internal/mithril-dmq/src/publisher/pallas.rs
+++ b/internal/mithril-dmq/src/publisher/pallas.rs
@@ -82,7 +82,6 @@ impl<M: TryToBytes + Debug + Sync + Send> DmqPublisher<M> for DmqPublisherPallas
 
 #[cfg(all(test, unix))]
 mod tests {
-
     use std::{fs, sync::Arc};
 
     use pallas_network::miniprotocols::{
@@ -91,7 +90,11 @@ mod tests {
     use tokio::{net::UnixListener, task::JoinHandle};
 
     use mithril_cardano_node_chain::test::double::FakeChainObserver;
-    use mithril_common::{crypto_helper::KesSignerFake, current_function, test_utils::TempDir};
+    use mithril_common::{
+        crypto_helper::KesSignerFake,
+        current_function,
+        test_utils::{TempDir, double::Dummy},
+    };
 
     use crate::{test::payload::DmqMessageTestPayload, test_tools::TestLogger};
 
diff --git a/internal/mithril-dmq/src/test/payload.rs b/internal/mithril-dmq/src/test/payload.rs
index 2283155c4fc..6fd5098d515 100644
--- a/internal/mithril-dmq/src/test/payload.rs
+++ b/internal/mithril-dmq/src/test/payload.rs
@@ -3,6 +3,7 @@ use std::fmt::Debug;
 use mithril_common::{
     StdResult,
     crypto_helper::{TryFromBytes, TryToBytes},
+    test_utils::double::Dummy,
 };
 
 /// A test message payload for the DMQ.
@@ -18,9 +19,11 @@ impl DmqMessageTestPayload {
             message: bytes.to_vec(),
         }
     }
+}
 
+impl Dummy for DmqMessageTestPayload {
     /// Creates a dummy `DmqMessageTestPayload` with a predefined message.
-    pub fn dummy() -> Self {
+    fn dummy() -> Self {
         Self {
             message: b"dummy message".to_vec(),
         }
diff --git a/internal/mithril-era/Cargo.toml b/internal/mithril-era/Cargo.toml
index 729896b74ff..17c9791ab17 100644
--- a/internal/mithril-era/Cargo.toml
+++ b/internal/mithril-era/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-era"
-version = "0.1.2"
+version = "0.1.3"
 authors.workspace = true
 documentation.workspace = true
 edition.workspace = true
diff --git a/internal/mithril-era/src/adapters/bootstrap.rs b/internal/mithril-era/src/adapters/bootstrap.rs
index f98fec178b3..ca3b0c1e38f 100644
--- a/internal/mithril-era/src/adapters/bootstrap.rs
+++ b/internal/mithril-era/src/adapters/bootstrap.rs
@@ -22,6 +22,8 @@ impl EraReaderAdapter for BootstrapAdapter {
 
 #[cfg(test)]
 mod tests {
+    use mithril_common::test_utils::double::Dummy;
+
     use super::*;
 
     #[tokio::test]
diff --git a/internal/mithril-era/src/adapters/dummy.rs b/internal/mithril-era/src/adapters/dummy.rs
index 0e7c641815d..1968496a84e 100644
--- a/internal/mithril-era/src/adapters/dummy.rs
+++ b/internal/mithril-era/src/adapters/dummy.rs
@@ -40,6 +40,7 @@ impl EraReaderAdapter for DummyAdapter {
 #[cfg(test)]
 mod tests {
     use mithril_common::entities::{Epoch, SupportedEra};
+    use mithril_common::test_utils::double::Dummy;
 
     use super::*;
 
diff --git a/internal/mithril-era/src/adapters/file.rs b/internal/mithril-era/src/adapters/file.rs
index 496af5cd8e9..4d4de67b093 100644
--- a/internal/mithril-era/src/adapters/file.rs
+++ b/internal/mithril-era/src/adapters/file.rs
@@ -30,7 +30,7 @@ impl EraReaderAdapter for FileAdapter {
 #[cfg(test)]
 mod tests {
     use mithril_common::entities::{Epoch, SupportedEra};
-    use mithril_common::test_utils::TempDir;
+    use mithril_common::test_utils::{TempDir, double::Dummy};
 
     use super::*;
 
diff --git a/internal/mithril-era/src/era_checker.rs b/internal/mithril-era/src/era_checker.rs
index 1ee811a246c..828aae208da 100644
--- a/internal/mithril-era/src/era_checker.rs
+++ b/internal/mithril-era/src/era_checker.rs
@@ -55,6 +55,8 @@ impl ApiVersionDiscriminantSource for EraChecker {
 
 #[cfg(test)]
 mod tests {
+    use mithril_common::test_utils::double::Dummy;
+
     use super::*;
 
     #[test]
diff --git a/internal/mithril-era/src/era_reader.rs b/internal/mithril-era/src/era_reader.rs
index 200962d1a4a..691bf69390b 100644
--- a/internal/mithril-era/src/era_reader.rs
+++ b/internal/mithril-era/src/era_reader.rs
@@ -176,6 +176,8 @@ impl EraReader {
 
 #[cfg(test)]
 mod tests {
+    use mithril_common::test_utils::double::Dummy;
+
     use super::super::adapters::EraReaderDummyAdapter as DummyAdapter;
     use super::*;
 
diff --git a/internal/signed-entity/mithril-signed-entity-preloader/Cargo.toml b/internal/signed-entity/mithril-signed-entity-preloader/Cargo.toml
index 508cfa12760..eec113401e0 100644
--- a/internal/signed-entity/mithril-signed-entity-preloader/Cargo.toml
+++ b/internal/signed-entity/mithril-signed-entity-preloader/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-signed-entity-preloader"
-version = "0.0.7"
+version = "0.0.8"
 description = "A preload mechanism for Cardano Transaction signed entity."
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/internal/signed-entity/mithril-signed-entity-preloader/src/cardano_transactions_preloader.rs b/internal/signed-entity/mithril-signed-entity-preloader/src/cardano_transactions_preloader.rs
index f50c729f31e..9cf2f04f759 100644
--- a/internal/signed-entity/mithril-signed-entity-preloader/src/cardano_transactions_preloader.rs
+++ b/internal/signed-entity/mithril-signed-entity-preloader/src/cardano_transactions_preloader.rs
@@ -128,6 +128,7 @@ mod tests {
 
     use mithril_cardano_node_chain::test::double::FakeChainObserver;
     use mithril_common::entities::{BlockNumber, ChainPoint, TimePoint};
+    use mithril_common::test_utils::double::Dummy;
 
     use crate::test_tools::TestLogger;
 
diff --git a/internal/tests/mithril-api-spec/Cargo.toml b/internal/tests/mithril-api-spec/Cargo.toml
index 129c0d555bc..3e4ad960099 100644
--- a/internal/tests/mithril-api-spec/Cargo.toml
+++ b/internal/tests/mithril-api-spec/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-api-spec"
-version = "0.1.1"
+version = "0.1.2"
 authors.workspace = true
 documentation.workspace = true
 edition.workspace = true
diff --git a/internal/tests/mithril-api-spec/src/apispec.rs b/internal/tests/mithril-api-spec/src/apispec.rs
index de6a2d5d53d..74da2774683 100644
--- a/internal/tests/mithril-api-spec/src/apispec.rs
+++ b/internal/tests/mithril-api-spec/src/apispec.rs
@@ -343,7 +343,7 @@ mod tests {
 
     use mithril_common::entities;
     use mithril_common::messages::{AggregatorFeaturesMessage, SignerMessagePart};
-    use mithril_common::test_utils::{TempDir, fake_data};
+    use mithril_common::test_utils::{TempDir, double::Dummy, fake_data};
 
     use super::*;
 
diff --git a/mithril-aggregator/Cargo.toml b/mithril-aggregator/Cargo.toml
index 2acddb8589a..fb6c02bd0a0 100644
--- a/mithril-aggregator/Cargo.toml
+++ b/mithril-aggregator/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-aggregator"
-version = "0.7.74"
+version = "0.7.75"
 description = "A Mithril Aggregator server"
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-aggregator/src/artifact_builder/cardano_database_artifacts/ancillary.rs b/mithril-aggregator/src/artifact_builder/cardano_database_artifacts/ancillary.rs
index b9792890deb..31a60961d92 100644
--- a/mithril-aggregator/src/artifact_builder/cardano_database_artifacts/ancillary.rs
+++ b/mithril-aggregator/src/artifact_builder/cardano_database_artifacts/ancillary.rs
@@ -206,7 +206,7 @@ impl AncillaryArtifactBuilder {
 mod tests {
     use std::path::PathBuf;
 
-    use mithril_common::test_utils::{TempDir, assert_equivalent};
+    use mithril_common::test_utils::{TempDir, assert_equivalent, double::Dummy};
 
     use crate::services::{DumbSnapshotter, MockSnapshotter};
     use crate::test_tools::TestLogger;
diff --git a/mithril-aggregator/src/artifact_builder/cardano_database_artifacts/digest.rs b/mithril-aggregator/src/artifact_builder/cardano_database_artifacts/digest.rs
index 7841e4f5758..f63382bebd4 100644
--- a/mithril-aggregator/src/artifact_builder/cardano_database_artifacts/digest.rs
+++ b/mithril-aggregator/src/artifact_builder/cardano_database_artifacts/digest.rs
@@ -299,7 +299,7 @@ mod tests {
         current_function,
         entities::{CardanoDbBeacon, CompressionAlgorithm},
         messages::{CardanoDatabaseDigestListItemMessage, CardanoDatabaseDigestListMessage},
-        test_utils::{TempDir, assert_equivalent},
+        test_utils::{TempDir, assert_equivalent, double::Dummy},
     };
 
     use crate::{
diff --git a/mithril-aggregator/src/artifact_builder/mithril_stake_distribution.rs b/mithril-aggregator/src/artifact_builder/mithril_stake_distribution.rs
index d4baa074c18..a858d606135 100644
--- a/mithril-aggregator/src/artifact_builder/mithril_stake_distribution.rs
+++ b/mithril-aggregator/src/artifact_builder/mithril_stake_distribution.rs
@@ -38,7 +38,10 @@ impl ArtifactBuilder<Epoch, MithrilStakeDistribution> for MithrilStakeDistributi
 
 #[cfg(test)]
 mod tests {
-    use mithril_common::{crypto_helper::ProtocolParameters, test_utils::fake_data};
+    use mithril_common::{
+        crypto_helper::ProtocolParameters,
+        test_utils::{double::Dummy, fake_data},
+    };
     use std::sync::Arc;
     use tokio::sync::RwLock;
 
diff --git a/mithril-aggregator/src/database/query/open_message/insert_or_replace_open_message.rs b/mithril-aggregator/src/database/query/open_message/insert_or_replace_open_message.rs
index 358fed71d42..b5f35588ba3 100644
--- a/mithril-aggregator/src/database/query/open_message/insert_or_replace_open_message.rs
+++ b/mithril-aggregator/src/database/query/open_message/insert_or_replace_open_message.rs
@@ -34,6 +34,7 @@ impl Query for InsertOrReplaceOpenMessageQuery {
 
 #[cfg(test)]
 mod tests {
+    use mithril_common::test_utils::double::Dummy;
     use mithril_persistence::sqlite::ConnectionExtensions;
 
     use crate::database::query::GetOpenMessageQuery;
diff --git a/mithril-aggregator/src/database/record/immutable_file_digest.rs b/mithril-aggregator/src/database/record/immutable_file_digest.rs
index 36e280d9a97..e7c587ae042 100644
--- a/mithril-aggregator/src/database/record/immutable_file_digest.rs
+++ b/mithril-aggregator/src/database/record/immutable_file_digest.rs
@@ -19,15 +19,6 @@ impl ImmutableFileDigestRecord {
         let aliases = SourceAlias::new(&[("{:immutable_file_digest:}", table)]);
         Self::get_projection().expand(aliases)
     }
-
-    #[cfg(test)]
-    /// Create a dumb ImmutableFileDigestRecord instance mainly for test purposes
-    pub fn dummy() -> Self {
-        Self {
-            immutable_file_name: "123.chunk".to_string(),
-            digest: "dummy_digest".to_string(),
-        }
-    }
 }
 
 impl SqLiteEntity for ImmutableFileDigestRecord {
diff --git a/mithril-aggregator/src/database/record/open_message.rs b/mithril-aggregator/src/database/record/open_message.rs
index 40b0159dc75..062266164b0 100644
--- a/mithril-aggregator/src/database/record/open_message.rs
+++ b/mithril-aggregator/src/database/record/open_message.rs
@@ -43,25 +43,6 @@ impl OpenMessageRecord {
     pub fn new_id() -> Uuid {
         Uuid::new_v4()
     }
-
-    #[cfg(test)]
-    /// Create a dumb OpenMessage instance mainly for test purposes
-    pub fn dummy() -> Self {
-        let beacon = mithril_common::test_utils::fake_data::beacon();
-        let epoch = beacon.epoch;
-        let signed_entity_type = SignedEntityType::CardanoImmutableFilesFull(beacon);
-
-        Self {
-            open_message_id: Uuid::parse_str("193d1442-e89b-43cf-9519-04d8db9a12ff").unwrap(),
-            epoch,
-            signed_entity_type,
-            protocol_message: ProtocolMessage::new(),
-            is_certified: false,
-            is_expired: false,
-            created_at: Utc::now(),
-            expires_at: None,
-        }
-    }
 }
 
 impl SqLiteEntity for OpenMessageRecord {
diff --git a/mithril-aggregator/src/database/repository/epoch_settings_store.rs b/mithril-aggregator/src/database/repository/epoch_settings_store.rs
index 2fb2c266d0b..1a32f54947d 100644
--- a/mithril-aggregator/src/database/repository/epoch_settings_store.rs
+++ b/mithril-aggregator/src/database/repository/epoch_settings_store.rs
@@ -92,6 +92,8 @@ impl EpochPruningTask for EpochSettingsStore {
 
 #[cfg(test)]
 mod tests {
+    use mithril_common::test_utils::double::Dummy;
+
     use crate::database::test_helper::{insert_epoch_settings, main_db_connection};
 
     use super::*;
diff --git a/mithril-aggregator/src/database/repository/open_message_repository.rs b/mithril-aggregator/src/database/repository/open_message_repository.rs
index 57f36635ee8..0d6aa6a2ba6 100644
--- a/mithril-aggregator/src/database/repository/open_message_repository.rs
+++ b/mithril-aggregator/src/database/repository/open_message_repository.rs
@@ -140,6 +140,7 @@ impl OpenMessageStorer for OpenMessageRepository {
 #[cfg(test)]
 mod tests {
     use mithril_common::entities::{BlockNumber, CardanoDbBeacon};
+    use mithril_common::test_utils::double::Dummy;
 
     use crate::database::record::SingleSignatureRecord;
     use crate::database::test_helper::{
diff --git a/mithril-aggregator/src/dependency_injection/builder/support/compatibility.rs b/mithril-aggregator/src/dependency_injection/builder/support/compatibility.rs
index 1ee493d080e..9c25a9ae75b 100644
--- a/mithril-aggregator/src/dependency_injection/builder/support/compatibility.rs
+++ b/mithril-aggregator/src/dependency_injection/builder/support/compatibility.rs
@@ -33,7 +33,7 @@ impl DependenciesBuilder {
                 error: Some(e.into()),
             })?,
             _ => Arc::new(EraReaderDummyAdapter::from_markers(vec![EraMarker::new(
-                &SupportedEra::dummy().to_string(),
+                &SupportedEra::Pythagoras.to_string(),
                 Some(Epoch(0)),
             )])),
         };
diff --git a/mithril-aggregator/src/entities/aggregator_epoch_settings.rs b/mithril-aggregator/src/entities/aggregator_epoch_settings.rs
index 61ff980b062..014392f689c 100644
--- a/mithril-aggregator/src/entities/aggregator_epoch_settings.rs
+++ b/mithril-aggregator/src/entities/aggregator_epoch_settings.rs
@@ -9,20 +9,3 @@ pub struct AggregatorEpochSettings {
     /// Cardano transactions signing configuration
     pub cardano_transactions_signing_config: CardanoTransactionsSigningConfig,
 }
-
-impl AggregatorEpochSettings {
-    #[cfg(test)]
-    /// Create a dummy AggregatorEpochSettings
-    pub fn dummy() -> AggregatorEpochSettings {
-        use mithril_common::test_utils::fake_data;
-
-        let protocol_parameters = fake_data::protocol_parameters();
-        let cardano_transactions_signing_config = CardanoTransactionsSigningConfig::dummy();
-
-        // Aggregator Epoch settings
-        AggregatorEpochSettings {
-            protocol_parameters,
-            cardano_transactions_signing_config,
-        }
-    }
-}
diff --git a/mithril-aggregator/src/entities/leader_aggregator_epoch_settings.rs b/mithril-aggregator/src/entities/leader_aggregator_epoch_settings.rs
index c620bf04397..cbd0a421c1a 100644
--- a/mithril-aggregator/src/entities/leader_aggregator_epoch_settings.rs
+++ b/mithril-aggregator/src/entities/leader_aggregator_epoch_settings.rs
@@ -23,37 +23,3 @@ pub struct LeaderAggregatorEpochSettings {
     /// Cardano transactions signing configuration for the next epoch
     pub next_cardano_transactions_signing_config: Option<CardanoTransactionsSigningConfig>,
 }
-
-impl LeaderAggregatorEpochSettings {
-    #[cfg(test)]
-    /// Create a dummy LeaderAggregatorEpochSettings
-    pub fn dummy() -> LeaderAggregatorEpochSettings {
-        use mithril_common::test_utils::fake_data;
-
-        // Beacon
-        let beacon = fake_data::beacon();
-
-        // Registration protocol parameters
-        let registration_protocol_parameters = fake_data::protocol_parameters();
-
-        // Signers
-        let signers = fake_data::signers(5);
-        let current_signers = signers[1..3].to_vec();
-        let next_signers = signers[2..5].to_vec();
-
-        // Cardano transactions signing configuration
-        let cardano_transactions_signing_config = Some(CardanoTransactionsSigningConfig::dummy());
-        let next_cardano_transactions_signing_config =
-            Some(CardanoTransactionsSigningConfig::dummy());
-
-        // Signer Epoch settings
-        LeaderAggregatorEpochSettings {
-            epoch: beacon.epoch,
-            registration_protocol_parameters,
-            current_signers,
-            next_signers,
-            cardano_transactions_signing_config,
-            next_cardano_transactions_signing_config,
-        }
-    }
-}
diff --git a/mithril-aggregator/src/entities/open_message.rs b/mithril-aggregator/src/entities/open_message.rs
index 813ba0648b3..453755dd71f 100644
--- a/mithril-aggregator/src/entities/open_message.rs
+++ b/mithril-aggregator/src/entities/open_message.rs
@@ -46,30 +46,6 @@ impl OpenMessage {
             .map(|sig| sig.party_id.to_owned())
             .collect()
     }
-
-    #[cfg(test)]
-    /// Create a dumb OpenMessage instance mainly for test purposes
-    pub fn dummy() -> Self {
-        use mithril_common::test_utils::fake_data;
-
-        let beacon = fake_data::beacon();
-        let epoch = beacon.epoch;
-        let signed_entity_type = SignedEntityType::CardanoImmutableFilesFull(beacon);
-
-        Self {
-            epoch,
-            signed_entity_type,
-            protocol_message: ProtocolMessage::new(),
-            is_certified: false,
-            is_expired: false,
-            single_signatures: vec![
-                fake_data::single_signature(vec![1, 4, 5]),
-                fake_data::single_signature(vec![2, 3, 8]),
-            ],
-            created_at: Utc::now(),
-            expires_at: None,
-        }
-    }
 }
 
 impl From<OpenMessageRecord> for OpenMessage {
@@ -109,7 +85,7 @@ mod test {
 
     use mithril_common::{
         entities::{Epoch, ProtocolMessage, SignedEntityType},
-        test_utils::fake_data,
+        test_utils::{double::Dummy, fake_data},
     };
 
     use crate::database::record::{OpenMessageRecord, OpenMessageWithSingleSignaturesRecord};
diff --git a/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_database.rs b/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_database.rs
index 9a6f0bb59bf..60f782a476f 100644
--- a/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_database.rs
+++ b/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_database.rs
@@ -182,6 +182,7 @@ mod tests {
         CardanoDatabaseDigestListItemMessage, CardanoDatabaseSnapshotListItemMessage,
         CardanoDatabaseSnapshotMessage,
     };
+    use mithril_common::test_utils::double::Dummy;
     use mithril_common::{MITHRIL_CLIENT_TYPE_HEADER, MITHRIL_ORIGIN_TAG_HEADER};
     use mithril_persistence::sqlite::HydrationError;
 
diff --git a/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_stake_distribution.rs b/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_stake_distribution.rs
index a3300483e39..f4e2f34d4aa 100644
--- a/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_stake_distribution.rs
+++ b/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_stake_distribution.rs
@@ -170,6 +170,7 @@ pub mod tests {
     use mithril_common::{
         MITHRIL_CLIENT_TYPE_HEADER, MITHRIL_ORIGIN_TAG_HEADER,
         messages::{CardanoStakeDistributionListItemMessage, CardanoStakeDistributionMessage},
+        test_utils::double::Dummy,
     };
 
     use crate::{initialize_dependencies, services::MockMessageService};
diff --git a/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_transaction.rs b/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_transaction.rs
index 30c789f79b8..a5c254d5679 100644
--- a/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_transaction.rs
+++ b/mithril-aggregator/src/http_server/routes/artifact_routes/cardano_transaction.rs
@@ -108,6 +108,7 @@ pub mod tests {
     use mithril_common::{
         MITHRIL_CLIENT_TYPE_HEADER, MITHRIL_ORIGIN_TAG_HEADER,
         messages::{CardanoTransactionSnapshotListItemMessage, CardanoTransactionSnapshotMessage},
+        test_utils::double::Dummy,
     };
     use mithril_persistence::sqlite::HydrationError;
 
diff --git a/mithril-aggregator/src/http_server/routes/artifact_routes/mithril_stake_distribution.rs b/mithril-aggregator/src/http_server/routes/artifact_routes/mithril_stake_distribution.rs
index f69e87f1083..7dfedbf533b 100644
--- a/mithril-aggregator/src/http_server/routes/artifact_routes/mithril_stake_distribution.rs
+++ b/mithril-aggregator/src/http_server/routes/artifact_routes/mithril_stake_distribution.rs
@@ -108,6 +108,7 @@ pub mod tests {
     use mithril_common::{
         MITHRIL_CLIENT_TYPE_HEADER, MITHRIL_ORIGIN_TAG_HEADER,
         messages::{MithrilStakeDistributionListItemMessage, MithrilStakeDistributionMessage},
+        test_utils::double::Dummy,
     };
     use mithril_persistence::sqlite::HydrationError;
 
diff --git a/mithril-aggregator/src/http_server/routes/artifact_routes/snapshot.rs b/mithril-aggregator/src/http_server/routes/artifact_routes/snapshot.rs
index fa9a6041400..bb6c6c2f570 100644
--- a/mithril-aggregator/src/http_server/routes/artifact_routes/snapshot.rs
+++ b/mithril-aggregator/src/http_server/routes/artifact_routes/snapshot.rs
@@ -215,7 +215,7 @@ mod tests {
         MITHRIL_CLIENT_TYPE_HEADER, MITHRIL_ORIGIN_TAG_HEADER,
         entities::{CardanoDbBeacon, SignedEntityType, Snapshot},
         messages::{SnapshotListItemMessage, SnapshotMessage},
-        test_utils::fake_data,
+        test_utils::{double::Dummy, fake_data},
     };
     use mithril_persistence::sqlite::HydrationError;
 
diff --git a/mithril-aggregator/src/http_server/routes/epoch_routes.rs b/mithril-aggregator/src/http_server/routes/epoch_routes.rs
index 0c52025a7d6..2cb525a90e7 100644
--- a/mithril-aggregator/src/http_server/routes/epoch_routes.rs
+++ b/mithril-aggregator/src/http_server/routes/epoch_routes.rs
@@ -67,6 +67,7 @@ mod tests {
 
     use mithril_api_spec::APISpec;
     use mithril_common::messages::EpochSettingsMessage;
+    use mithril_common::test_utils::double::Dummy;
 
     use crate::{initialize_dependencies, services::MockMessageService};
 
diff --git a/mithril-aggregator/src/http_server/routes/middlewares.rs b/mithril-aggregator/src/http_server/routes/middlewares.rs
index 3caed01a0fa..5dde0112d0e 100644
--- a/mithril-aggregator/src/http_server/routes/middlewares.rs
+++ b/mithril-aggregator/src/http_server/routes/middlewares.rs
@@ -209,7 +209,6 @@ pub mod validators {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use serde_json::Value;
     use std::convert::Infallible;
     use warp::{
@@ -219,9 +218,13 @@ mod tests {
         test::request,
     };
 
+    use mithril_common::test_utils::double::Dummy;
+
     use crate::http_server::routes::reply;
     use crate::initialize_dependencies;
 
+    use super::*;
+
     async fn route_handler(value: Option<String>) -> Result<impl warp::Reply, Infallible> {
         Ok(reply::json(&value, StatusCode::OK))
     }
diff --git a/mithril-aggregator/src/http_server/routes/proof_routes.rs b/mithril-aggregator/src/http_server/routes/proof_routes.rs
index 5b3180b2afb..293feb79a46 100644
--- a/mithril-aggregator/src/http_server/routes/proof_routes.rs
+++ b/mithril-aggregator/src/http_server/routes/proof_routes.rs
@@ -164,7 +164,7 @@ mod tests {
         MITHRIL_CLIENT_TYPE_HEADER, MITHRIL_ORIGIN_TAG_HEADER,
         entities::{BlockNumber, CardanoTransactionsSetProof, CardanoTransactionsSnapshot},
         signable_builder::SignedEntity,
-        test_utils::{assert_equivalent, fake_data},
+        test_utils::{assert_equivalent, double::Dummy, fake_data},
     };
 
     use crate::services::MockProverService;
@@ -196,7 +196,7 @@ mod tests {
 
         let signed_entity = SignedEntity::<CardanoTransactionsSnapshot> {
             artifact: cardano_transactions_snapshot,
-            ..SignedEntity::<CardanoTransactionsSnapshot>::dummy()
+            ..Dummy::dummy()
         };
 
         // Action
diff --git a/mithril-aggregator/src/http_server/routes/root_routes.rs b/mithril-aggregator/src/http_server/routes/root_routes.rs
index 8e91aa449f6..3dbf68f5da8 100644
--- a/mithril-aggregator/src/http_server/routes/root_routes.rs
+++ b/mithril-aggregator/src/http_server/routes/root_routes.rs
@@ -91,6 +91,7 @@ mod tests {
     use mithril_common::messages::{
         AggregatorCapabilities, AggregatorFeaturesMessage, CardanoTransactionsProverCapabilities,
     };
+    use mithril_common::test_utils::double::Dummy;
 
     use crate::http_server::routes::router::RouterConfig;
     use crate::initialize_dependencies;
diff --git a/mithril-aggregator/src/http_server/routes/router.rs b/mithril-aggregator/src/http_server/routes/router.rs
index f343160afdf..1eb45116364 100644
--- a/mithril-aggregator/src/http_server/routes/router.rs
+++ b/mithril-aggregator/src/http_server/routes/router.rs
@@ -8,6 +8,8 @@ use crate::tools::url_sanitizer::SanitizedUrlWithTrailingSlash;
 
 use mithril_common::api_version::APIVersionProvider;
 use mithril_common::entities::SignedEntityTypeDiscriminants;
+#[cfg(test)]
+use mithril_common::test_utils::double::Dummy;
 use mithril_common::{
     CardanoNetwork, MITHRIL_API_VERSION_HEADER, MITHRIL_CLIENT_TYPE_HEADER,
     MITHRIL_ORIGIN_TAG_HEADER,
@@ -36,8 +38,8 @@ pub struct RouterConfig {
 }
 
 #[cfg(test)]
-impl RouterConfig {
-    pub fn dummy() -> Self {
+impl Dummy for RouterConfig {
+    fn dummy() -> Self {
         Self {
             network: CardanoNetwork::TestNet(87),
             server_url: SanitizedUrlWithTrailingSlash::parse("http://0.0.0.0:8000/").unwrap(),
@@ -53,7 +55,10 @@ impl RouterConfig {
             origin_tag_white_list: HashSet::from(["DUMMY_TAG".to_string()]),
         }
     }
+}
 
+#[cfg(test)]
+impl RouterConfig {
     pub fn dummy_with_origin_tag_white_list(origin_tag_white_list: &[&str]) -> Self {
         Self {
             origin_tag_white_list: origin_tag_white_list
diff --git a/mithril-aggregator/src/http_server/routes/signatures_routes.rs b/mithril-aggregator/src/http_server/routes/signatures_routes.rs
index 58ce1cf72c2..d4153aab547 100644
--- a/mithril-aggregator/src/http_server/routes/signatures_routes.rs
+++ b/mithril-aggregator/src/http_server/routes/signatures_routes.rs
@@ -126,7 +126,10 @@ mod tests {
     use warp::test::request;
 
     use mithril_api_spec::APISpec;
-    use mithril_common::{entities::SignedEntityType, messages::RegisterSignatureMessageHttp};
+    use mithril_common::{
+        entities::SignedEntityType, messages::RegisterSignatureMessageHttp,
+        test_utils::double::Dummy,
+    };
 
     use crate::{
         SingleSignatureAuthenticator, initialize_dependencies,
diff --git a/mithril-aggregator/src/http_server/routes/signer_routes.rs b/mithril-aggregator/src/http_server/routes/signer_routes.rs
index c9e11644a84..9bdea379c17 100644
--- a/mithril-aggregator/src/http_server/routes/signer_routes.rs
+++ b/mithril-aggregator/src/http_server/routes/signer_routes.rs
@@ -271,7 +271,7 @@ mod tests {
         crypto_helper::ProtocolRegistrationError,
         entities::Epoch,
         messages::RegisterSignerMessage,
-        test_utils::{MithrilFixtureBuilder, fake_data},
+        test_utils::{MithrilFixtureBuilder, double::Dummy, fake_data},
     };
 
     use crate::{
diff --git a/mithril-aggregator/src/http_server/routes/statistics_routes.rs b/mithril-aggregator/src/http_server/routes/statistics_routes.rs
index a53430d195b..7a3d7ed3b2c 100644
--- a/mithril-aggregator/src/http_server/routes/statistics_routes.rs
+++ b/mithril-aggregator/src/http_server/routes/statistics_routes.rs
@@ -232,7 +232,9 @@ mod tests {
     use mithril_common::messages::{
         CardanoDatabaseImmutableFilesRestoredMessage, SnapshotDownloadMessage,
     };
-    use mithril_common::{MITHRIL_CLIENT_TYPE_HEADER, MITHRIL_ORIGIN_TAG_HEADER, temp_dir};
+    use mithril_common::{
+        MITHRIL_CLIENT_TYPE_HEADER, MITHRIL_ORIGIN_TAG_HEADER, temp_dir, test_utils::double::Dummy,
+    };
 
     use crate::ServeCommandDependenciesContainer;
     use crate::event_store::EventMessage;
diff --git a/mithril-aggregator/src/http_server/routes/status.rs b/mithril-aggregator/src/http_server/routes/status.rs
index 4660db70add..9092c882067 100644
--- a/mithril-aggregator/src/http_server/routes/status.rs
+++ b/mithril-aggregator/src/http_server/routes/status.rs
@@ -115,7 +115,7 @@ mod tests {
     use mithril_api_spec::APISpec;
     use mithril_common::{
         entities::{Epoch, ProtocolParameters, Stake},
-        test_utils::{MithrilFixtureBuilder, fake_data},
+        test_utils::{MithrilFixtureBuilder, double::Dummy, fake_data},
     };
 
     use crate::{
diff --git a/mithril-aggregator/src/lib.rs b/mithril-aggregator/src/lib.rs
index fe3de133ed7..e1d0fe37b65 100644
--- a/mithril-aggregator/src/lib.rs
+++ b/mithril-aggregator/src/lib.rs
@@ -27,6 +27,8 @@ mod multi_signer;
 mod runtime;
 pub mod services;
 mod store;
+#[doc(hidden)]
+pub mod test;
 mod tools;
 
 pub use crate::artifact_builder::ArtifactBuilder;
diff --git a/mithril-aggregator/src/message_adapters/from_epoch_settings.rs b/mithril-aggregator/src/message_adapters/from_epoch_settings.rs
index 59ad38126b2..f3fb7d2410b 100644
--- a/mithril-aggregator/src/message_adapters/from_epoch_settings.rs
+++ b/mithril-aggregator/src/message_adapters/from_epoch_settings.rs
@@ -32,6 +32,8 @@ impl TryFromMessageAdapter<EpochSettingsMessage, LeaderAggregatorEpochSettings>
 
 #[cfg(test)]
 mod tests {
+    use mithril_common::test_utils::double::Dummy;
+
     use super::*;
 
     #[test]
diff --git a/mithril-aggregator/src/message_adapters/from_register_signature.rs b/mithril-aggregator/src/message_adapters/from_register_signature.rs
index 1472ff683b0..6b232f4747b 100644
--- a/mithril-aggregator/src/message_adapters/from_register_signature.rs
+++ b/mithril-aggregator/src/message_adapters/from_register_signature.rs
@@ -28,6 +28,8 @@ impl TryFromMessageAdapter<RegisterSignatureMessageHttp, SingleSignature>
 
 #[cfg(test)]
 mod tests {
+    use mithril_common::test_utils::double::Dummy;
+
     use super::*;
 
     #[test]
diff --git a/mithril-aggregator/src/message_adapters/from_register_signer.rs b/mithril-aggregator/src/message_adapters/from_register_signer.rs
index 5b436c439f3..5694d8dc868 100644
--- a/mithril-aggregator/src/message_adapters/from_register_signer.rs
+++ b/mithril-aggregator/src/message_adapters/from_register_signer.rs
@@ -39,6 +39,8 @@ impl TryFromMessageAdapter<RegisterSignerMessage, Signer> for FromRegisterSigner
 
 #[cfg(test)]
 mod tests {
+    use mithril_common::test_utils::double::Dummy;
+
     use super::*;
 
     #[test]
diff --git a/mithril-aggregator/src/message_adapters/to_cardano_transactions_proof_message.rs b/mithril-aggregator/src/message_adapters/to_cardano_transactions_proof_message.rs
index c18b90ae7da..518debb414a 100644
--- a/mithril-aggregator/src/message_adapters/to_cardano_transactions_proof_message.rs
+++ b/mithril-aggregator/src/message_adapters/to_cardano_transactions_proof_message.rs
@@ -60,6 +60,7 @@ fn try_adapt_set_proof_message(
 #[cfg(test)]
 mod tests {
     use mithril_common::crypto_helper::MKProof;
+    use mithril_common::test_utils::double::Dummy;
 
     use super::*;
 
diff --git a/mithril-aggregator/src/multi_signer.rs b/mithril-aggregator/src/multi_signer.rs
index cf1e0a0b512..a65ec518918 100644
--- a/mithril-aggregator/src/multi_signer.rs
+++ b/mithril-aggregator/src/multi_signer.rs
@@ -146,7 +146,7 @@ mod tests {
     use mithril_common::crypto_helper::tests_setup::*;
     use mithril_common::entities::{CardanoDbBeacon, Epoch, SignedEntityType, SignerWithStake};
     use mithril_common::protocol::ToMessage;
-    use mithril_common::test_utils::{MithrilFixtureBuilder, fake_data};
+    use mithril_common::test_utils::{MithrilFixtureBuilder, double::Dummy, fake_data};
 
     use crate::entities::AggregatorEpochSettings;
     use crate::services::{FakeEpochService, FakeEpochServiceBuilder};
diff --git a/mithril-aggregator/src/runtime/runner.rs b/mithril-aggregator/src/runtime/runner.rs
index affffc98395..79700d2c806 100644
--- a/mithril-aggregator/src/runtime/runner.rs
+++ b/mithril-aggregator/src/runtime/runner.rs
@@ -549,7 +549,7 @@ pub mod tests {
         },
         signable_builder::SignableBuilderService,
         temp_dir,
-        test_utils::{MithrilFixtureBuilder, fake_data},
+        test_utils::{MithrilFixtureBuilder, double::Dummy, fake_data},
     };
     use mithril_persistence::store::StakeStorer;
     use mithril_signed_entity_lock::SignedEntityTypeLock;
diff --git a/mithril-aggregator/src/runtime/state_machine.rs b/mithril-aggregator/src/runtime/state_machine.rs
index 3b5453011d4..c290ee8d48c 100644
--- a/mithril-aggregator/src/runtime/state_machine.rs
+++ b/mithril-aggregator/src/runtime/state_machine.rs
@@ -383,13 +383,13 @@ impl AggregatorRuntime {
 
 #[cfg(test)]
 mod tests {
-    use crate::entities::OpenMessage;
     use anyhow::anyhow;
     use mockall::predicate;
     use std::time::Duration;
 
-    use mithril_common::test_utils::fake_data;
+    use mithril_common::test_utils::{double::Dummy, fake_data};
 
+    use crate::entities::OpenMessage;
     use crate::test_tools::TestLogger;
 
     use super::super::runner::MockAggregatorRunner;
diff --git a/mithril-aggregator/src/services/aggregator_client.rs b/mithril-aggregator/src/services/aggregator_client.rs
index a81f42928cf..4b09c7c517f 100644
--- a/mithril-aggregator/src/services/aggregator_client.rs
+++ b/mithril-aggregator/src/services/aggregator_client.rs
@@ -383,6 +383,8 @@ impl RemoteCertificateRetriever for AggregatorHTTPClient {
 pub(crate) mod dumb {
     use tokio::sync::RwLock;
 
+    use mithril_common::test_utils::double::Dummy;
+
     use super::*;
 
     /// This aggregator client is intended to be used by test services.
@@ -421,6 +423,7 @@ mod tests {
 
     use mithril_common::api_version::DummyApiVersionDiscriminantSource;
     use mithril_common::messages::CertificateListItemMessage;
+    use mithril_common::test_utils::double::Dummy;
 
     use crate::test_tools::TestLogger;
 
diff --git a/mithril-aggregator/src/services/certificate_chain_synchronizer/synchronizer_service.rs b/mithril-aggregator/src/services/certificate_chain_synchronizer/synchronizer_service.rs
index 7342e9c3f6b..0eb8261f304 100644
--- a/mithril-aggregator/src/services/certificate_chain_synchronizer/synchronizer_service.rs
+++ b/mithril-aggregator/src/services/certificate_chain_synchronizer/synchronizer_service.rs
@@ -235,8 +235,8 @@ mod tests {
     use crate::services::{
         MockOpenMessageStorer, MockRemoteCertificateRetriever, MockSynchronizedCertificateStorer,
     };
+    use crate::test::mocks::MockCertificateVerifier;
     use crate::test_tools::TestLogger;
-    use crate::tools::mocks::MockCertificateVerifier;
 
     use super::*;
 
diff --git a/mithril-aggregator/src/services/certifier/buffered_certifier.rs b/mithril-aggregator/src/services/certifier/buffered_certifier.rs
index 9c9581b89b9..7d7f34a736b 100644
--- a/mithril-aggregator/src/services/certifier/buffered_certifier.rs
+++ b/mithril-aggregator/src/services/certifier/buffered_certifier.rs
@@ -191,7 +191,7 @@ mod tests {
         CardanoTransactions, MithrilStakeDistribution,
     };
     use mithril_common::entities::SingleSignatureAuthenticationStatus;
-    use mithril_common::test_utils::fake_data;
+    use mithril_common::test_utils::{double::Dummy, fake_data};
 
     use crate::database::repository::BufferedSingleSignatureRepository;
     use crate::database::test_helper::main_db_connection;
diff --git a/mithril-aggregator/src/services/epoch_service.rs b/mithril-aggregator/src/services/epoch_service.rs
index 42c2f336980..be9174a3cde 100644
--- a/mithril-aggregator/src/services/epoch_service.rs
+++ b/mithril-aggregator/src/services/epoch_service.rs
@@ -560,7 +560,7 @@ pub(crate) struct FakeEpochServiceBuilder {
 #[cfg(test)]
 impl FakeEpochServiceBuilder {
     pub fn dummy(epoch: Epoch) -> Self {
-        use mithril_common::test_utils::fake_data;
+        use mithril_common::test_utils::{double::Dummy, fake_data};
         let signers = fake_data::signers_with_stakes(3);
 
         Self {
@@ -640,6 +640,7 @@ impl FakeEpochService {
         fixture: &mithril_common::test_utils::MithrilFixture,
     ) -> Self {
         use mithril_common::entities::CardanoTransactionsSigningConfig;
+        use mithril_common::test_utils::double::Dummy;
 
         let current_epoch_settings = AggregatorEpochSettings {
             protocol_parameters: fixture.protocol_parameters(),
@@ -840,13 +841,14 @@ mod tests {
         BlockNumber, CardanoTransactionsSigningConfig, Stake, StakeDistribution, SupportedEra,
     };
     use mithril_common::test_utils::{
-        MithrilFixture, MithrilFixtureBuilder, StakeDistributionGenerationMethod, fake_data,
+        MithrilFixture, MithrilFixtureBuilder, StakeDistributionGenerationMethod, double::Dummy,
+        fake_data,
     };
     use mockall::predicate::eq;
 
     use crate::store::{FakeEpochSettingsStorer, MockVerificationKeyStorer};
+    use crate::test::mocks::MockStakeStore;
     use crate::test_tools::TestLogger;
-    use crate::tools::mocks::MockStakeStore;
 
     use super::*;
 
diff --git a/mithril-aggregator/src/services/message.rs b/mithril-aggregator/src/services/message.rs
index 6db467de300..b7b3639dace 100644
--- a/mithril-aggregator/src/services/message.rs
+++ b/mithril-aggregator/src/services/message.rs
@@ -342,7 +342,7 @@ impl MessageService for MithrilMessageService {
 #[cfg(test)]
 mod tests {
     use mithril_common::entities::{BlockNumber, Certificate, SignedEntityType};
-    use mithril_common::test_utils::fake_data;
+    use mithril_common::test_utils::{double::Dummy, fake_data};
     use tokio::sync::RwLock;
 
     use crate::database::record::SignedEntityRecord;
diff --git a/mithril-aggregator/src/services/signable_builder/signable_seed_builder.rs b/mithril-aggregator/src/services/signable_builder/signable_seed_builder.rs
index 3c6b75ae2ce..92f332ce6bd 100644
--- a/mithril-aggregator/src/services/signable_builder/signable_seed_builder.rs
+++ b/mithril-aggregator/src/services/signable_builder/signable_seed_builder.rs
@@ -58,7 +58,7 @@ impl SignableSeedBuilder for AggregatorSignableSeedBuilder {
 mod tests {
     use mithril_common::{
         entities::Epoch,
-        test_utils::{MithrilFixture, MithrilFixtureBuilder},
+        test_utils::{MithrilFixture, MithrilFixtureBuilder, double::Dummy},
     };
 
     use crate::{entities::AggregatorEpochSettings, services::FakeEpochServiceBuilder};
diff --git a/mithril-aggregator/src/services/signature_consumer/dmq.rs b/mithril-aggregator/src/services/signature_consumer/dmq.rs
index badf6bc9770..ffc401d0dc7 100644
--- a/mithril-aggregator/src/services/signature_consumer/dmq.rs
+++ b/mithril-aggregator/src/services/signature_consumer/dmq.rs
@@ -55,7 +55,10 @@ impl SignatureConsumer for SignatureConsumerDmq {
 
 #[cfg(test)]
 mod tests {
-    use mithril_common::{crypto_helper::ProtocolSingleSignature, test_utils::fake_keys};
+    use mithril_common::{
+        crypto_helper::ProtocolSingleSignature,
+        test_utils::{double::Dummy, fake_keys},
+    };
     use mithril_dmq::test::double::DmqConsumerFake;
 
     use super::*;
diff --git a/mithril-aggregator/src/services/signer_registration/follower.rs b/mithril-aggregator/src/services/signer_registration/follower.rs
index 78f4a0b6ce5..6b5d2b2816d 100644
--- a/mithril-aggregator/src/services/signer_registration/follower.rs
+++ b/mithril-aggregator/src/services/signer_registration/follower.rs
@@ -180,7 +180,7 @@ mod tests {
     use mithril_common::messages::{
         EpochSettingsMessage, SignerMessagePart, TryFromMessageAdapter,
     };
-    use mithril_common::test_utils::MithrilFixtureBuilder;
+    use mithril_common::test_utils::{MithrilFixtureBuilder, double::Dummy};
 
     use crate::{
         database::{repository::SignerRegistrationStore, test_helper::main_db_connection},
@@ -189,7 +189,7 @@ mod tests {
             FakeEpochService, MockLeaderAggregatorClient, MockSignerRecorder,
             MockSignerRegistrationVerifier,
         },
-        tools::mocks::MockStakeStore,
+        test::mocks::MockStakeStore,
     };
 
     use super::*;
diff --git a/mithril-aggregator/src/services/signer_registration/verifier.rs b/mithril-aggregator/src/services/signer_registration/verifier.rs
index f5d134763e8..e2d8cffc042 100644
--- a/mithril-aggregator/src/services/signer_registration/verifier.rs
+++ b/mithril-aggregator/src/services/signer_registration/verifier.rs
@@ -80,7 +80,10 @@ impl SignerRegistrationVerifier for MithrilSignerRegistrationVerifier {
 #[cfg(test)]
 mod tests {
     use mithril_cardano_node_chain::test::double::FakeChainObserver;
-    use mithril_common::{entities::TimePoint, test_utils::MithrilFixtureBuilder};
+    use mithril_common::{
+        entities::TimePoint,
+        test_utils::{MithrilFixtureBuilder, double::Dummy},
+    };
 
     use super::*;
 
diff --git a/mithril-aggregator/src/services/stake_distribution.rs b/mithril-aggregator/src/services/stake_distribution.rs
index 1589cc8a048..e5a3b41af4e 100644
--- a/mithril-aggregator/src/services/stake_distribution.rs
+++ b/mithril-aggregator/src/services/stake_distribution.rs
@@ -227,7 +227,7 @@ mod tests {
     use mithril_common::temp_dir;
 
     use crate::dependency_injection::DependenciesBuilder;
-    use crate::tools::mocks::MockChainObserver;
+    use crate::test::mocks::MockChainObserver;
 
     use super::*;
 
diff --git a/mithril-aggregator/src/store/epoch_settings_storer.rs b/mithril-aggregator/src/store/epoch_settings_storer.rs
index a28d73b4d14..f322c86ca42 100644
--- a/mithril-aggregator/src/store/epoch_settings_storer.rs
+++ b/mithril-aggregator/src/store/epoch_settings_storer.rs
@@ -110,8 +110,8 @@ impl EpochPruningTask for FakeEpochSettingsStorer {
 
 #[cfg(test)]
 mod tests {
-
     use mithril_common::entities::CardanoTransactionsSigningConfig;
+    use mithril_common::test_utils::double::Dummy;
 
     use super::*;
 
diff --git a/mithril-aggregator/src/test/double/dummies.rs b/mithril-aggregator/src/test/double/dummies.rs
new file mode 100644
index 00000000000..5bb10cddff8
--- /dev/null
+++ b/mithril-aggregator/src/test/double/dummies.rs
@@ -0,0 +1,120 @@
+use chrono::Utc;
+use uuid::Uuid;
+
+use mithril_common::test_utils::{double::Dummy, fake_data};
+
+mod record {
+    use mithril_common::entities::{ProtocolMessage, SignedEntityType};
+
+    use crate::database::record::{ImmutableFileDigestRecord, OpenMessageRecord};
+
+    use super::*;
+
+    impl Dummy for ImmutableFileDigestRecord {
+        /// Create a dumb ImmutableFileDigestRecord instance mainly for test purposes
+        fn dummy() -> Self {
+            Self {
+                immutable_file_name: "123.chunk".to_string(),
+                digest: "dummy_digest".to_string(),
+            }
+        }
+    }
+
+    impl Dummy for OpenMessageRecord {
+        /// Create a dumb OpenMessage instance mainly for test purposes
+        fn dummy() -> Self {
+            let beacon = fake_data::beacon();
+            let epoch = beacon.epoch;
+            let signed_entity_type = SignedEntityType::CardanoImmutableFilesFull(beacon);
+
+            Self {
+                open_message_id: Uuid::parse_str("193d1442-e89b-43cf-9519-04d8db9a12ff").unwrap(),
+                epoch,
+                signed_entity_type,
+                protocol_message: ProtocolMessage::new(),
+                is_certified: false,
+                is_expired: false,
+                created_at: Utc::now(),
+                expires_at: None,
+            }
+        }
+    }
+}
+
+mod entities {
+    use mithril_common::entities::{
+        CardanoTransactionsSigningConfig, ProtocolMessage, SignedEntityType,
+    };
+
+    use crate::entities::{AggregatorEpochSettings, LeaderAggregatorEpochSettings, OpenMessage};
+
+    use super::*;
+
+    impl Dummy for AggregatorEpochSettings {
+        /// Create a dummy `AggregatorEpochSettings`
+        fn dummy() -> Self {
+            let protocol_parameters = fake_data::protocol_parameters();
+            let cardano_transactions_signing_config = CardanoTransactionsSigningConfig::dummy();
+
+            // Aggregator Epoch settings
+            AggregatorEpochSettings {
+                protocol_parameters,
+                cardano_transactions_signing_config,
+            }
+        }
+    }
+
+    impl Dummy for LeaderAggregatorEpochSettings {
+        /// Create a dummy `LeaderAggregatorEpochSettings`
+        fn dummy() -> Self {
+            // Beacon
+            let beacon = fake_data::beacon();
+
+            // Registration protocol parameters
+            let registration_protocol_parameters = fake_data::protocol_parameters();
+
+            // Signers
+            let signers = fake_data::signers(5);
+            let current_signers = signers[1..3].to_vec();
+            let next_signers = signers[2..5].to_vec();
+
+            // Cardano transactions signing configuration
+            let cardano_transactions_signing_config =
+                Some(CardanoTransactionsSigningConfig::dummy());
+            let next_cardano_transactions_signing_config =
+                Some(CardanoTransactionsSigningConfig::dummy());
+
+            // Signer Epoch settings
+            LeaderAggregatorEpochSettings {
+                epoch: beacon.epoch,
+                registration_protocol_parameters,
+                current_signers,
+                next_signers,
+                cardano_transactions_signing_config,
+                next_cardano_transactions_signing_config,
+            }
+        }
+    }
+
+    impl Dummy for OpenMessage {
+        fn dummy() -> Self {
+            let beacon = fake_data::beacon();
+            let epoch = beacon.epoch;
+            let signed_entity_type = SignedEntityType::CardanoImmutableFilesFull(beacon);
+
+            Self {
+                epoch,
+                signed_entity_type,
+                protocol_message: ProtocolMessage::new(),
+                is_certified: false,
+                is_expired: false,
+                single_signatures: vec![
+                    fake_data::single_signature(vec![1, 4, 5]),
+                    fake_data::single_signature(vec![2, 3, 8]),
+                ],
+                created_at: Utc::now(),
+                expires_at: None,
+            }
+        }
+    }
+}
diff --git a/mithril-aggregator/src/test/double/mod.rs b/mithril-aggregator/src/test/double/mod.rs
new file mode 100644
index 00000000000..7ee7ff27e5a
--- /dev/null
+++ b/mithril-aggregator/src/test/double/mod.rs
@@ -0,0 +1 @@
+mod dummies;
diff --git a/mithril-aggregator/src/tools/mocks.rs b/mithril-aggregator/src/test/mocks.rs
similarity index 100%
rename from mithril-aggregator/src/tools/mocks.rs
rename to mithril-aggregator/src/test/mocks.rs
diff --git a/mithril-aggregator/src/test/mod.rs b/mithril-aggregator/src/test/mod.rs
new file mode 100644
index 00000000000..3c35bb708a2
--- /dev/null
+++ b/mithril-aggregator/src/test/mod.rs
@@ -0,0 +1,3 @@
+mod double;
+#[cfg(test)]
+pub mod mocks;
diff --git a/mithril-aggregator/src/tools/certificates_hash_migrator.rs b/mithril-aggregator/src/tools/certificates_hash_migrator.rs
index 4d1505e4d40..da4fa368e85 100644
--- a/mithril-aggregator/src/tools/certificates_hash_migrator.rs
+++ b/mithril-aggregator/src/tools/certificates_hash_migrator.rs
@@ -216,6 +216,7 @@ mod test {
         Epoch, ImmutableFileNumber, SignedEntityConfig, SignedEntityType,
         SignedEntityTypeDiscriminants as Type, TimePoint,
     };
+    use mithril_common::test_utils::double::Dummy;
     use mithril_persistence::sqlite::{ConnectionBuilder, ConnectionOptions, SqliteConnection};
 
     use crate::database::record::{CertificateRecord, SignedEntityRecord};
diff --git a/mithril-aggregator/src/tools/file_archiver/entities.rs b/mithril-aggregator/src/tools/file_archiver/entities.rs
index 757816bdd5f..35a03f9bc06 100644
--- a/mithril-aggregator/src/tools/file_archiver/entities.rs
+++ b/mithril-aggregator/src/tools/file_archiver/entities.rs
@@ -50,16 +50,6 @@ impl FileArchive {
         }
     }
 
-    #[cfg(test)]
-    pub fn dummy() -> Self {
-        Self {
-            filepath: PathBuf::from("archive.tar.gz"),
-            archive_filesize: 10,
-            uncompressed_size: 789,
-            compression_algorithm: CompressionAlgorithm::Gzip,
-        }
-    }
-
     /// Get the path of the archive.
     pub fn get_file_path(&self) -> &Path {
         &self.filepath
@@ -104,6 +94,18 @@ impl FileArchive {
     }
 }
 
+#[cfg(test)]
+impl mithril_common::test_utils::double::Dummy for FileArchive {
+    fn dummy() -> Self {
+        Self {
+            filepath: PathBuf::from("archive.tar.gz"),
+            archive_filesize: 10,
+            uncompressed_size: 789,
+            compression_algorithm: CompressionAlgorithm::Gzip,
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/mithril-aggregator/src/tools/mod.rs b/mithril-aggregator/src/tools/mod.rs
index d8211a0f240..93163b0fd46 100644
--- a/mithril-aggregator/src/tools/mod.rs
+++ b/mithril-aggregator/src/tools/mod.rs
@@ -4,8 +4,6 @@ mod era;
 pub mod file_archiver;
 pub mod file_size;
 mod genesis;
-#[cfg(test)]
-pub mod mocks;
 mod signer_importer;
 mod single_signature_authenticator;
 pub mod url_sanitizer;
diff --git a/mithril-aggregator/tests/era_checker.rs b/mithril-aggregator/tests/era_checker.rs
index 4190b4f6b25..091e6ee7e36 100644
--- a/mithril-aggregator/tests/era_checker.rs
+++ b/mithril-aggregator/tests/era_checker.rs
@@ -5,7 +5,7 @@ use mithril_common::{
         BlockNumber, ChainPoint, Epoch, ProtocolParameters, SlotNumber, SupportedEra, TimePoint,
     },
     temp_dir,
-    test_utils::MithrilFixtureBuilder,
+    test_utils::{MithrilFixtureBuilder, double::Dummy},
 };
 use mithril_era::EraMarker;
 
diff --git a/mithril-aggregator/tests/test_extensions/runtime_tester.rs b/mithril-aggregator/tests/test_extensions/runtime_tester.rs
index 5cae914f313..6c974186e59 100644
--- a/mithril-aggregator/tests/test_extensions/runtime_tester.rs
+++ b/mithril-aggregator/tests/test_extensions/runtime_tester.rs
@@ -31,6 +31,7 @@ use mithril_common::{
     },
     test_utils::{
         MithrilFixture, MithrilFixtureBuilder, SignerFixture, StakeDistributionGenerationMethod,
+        double::Dummy,
     },
 };
 use mithril_era::{EraMarker, EraReader, adapters::EraReaderDummyAdapter};
diff --git a/mithril-client-cli/Cargo.toml b/mithril-client-cli/Cargo.toml
index 06538795ad7..efee7ba1041 100644
--- a/mithril-client-cli/Cargo.toml
+++ b/mithril-client-cli/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-client-cli"
-version = "0.12.22"
+version = "0.12.23"
 description = "A Mithril Client"
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-client-cli/src/commands/cardano_db/download/v1.rs b/mithril-client-cli/src/commands/cardano_db/download/v1.rs
index d37b7803180..62c82b0c9c9 100644
--- a/mithril-client-cli/src/commands/cardano_db/download/v1.rs
+++ b/mithril-client-cli/src/commands/cardano_db/download/v1.rs
@@ -236,7 +236,7 @@ mod tests {
         MithrilCertificateMetadata,
         common::{CardanoDbBeacon, ProtocolMessagePartKey, SignedEntityType},
     };
-    use mithril_common::test_utils::TempDir;
+    use mithril_common::test_utils::{TempDir, double::Dummy};
 
     use super::*;
 
diff --git a/mithril-client-cli/src/commands/cardano_db/download/v2.rs b/mithril-client-cli/src/commands/cardano_db/download/v2.rs
index b054424947e..9ea00495701 100644
--- a/mithril-client-cli/src/commands/cardano_db/download/v2.rs
+++ b/mithril-client-cli/src/commands/cardano_db/download/v2.rs
@@ -283,6 +283,7 @@ impl PreparedCardanoDbV2Download {
 #[cfg(test)]
 mod tests {
     use mithril_client::common::{AncillaryMessagePart, DigestsMessagePart, ImmutablesMessagePart};
+    use mithril_common::test_utils::double::Dummy;
 
     use super::*;
 
diff --git a/mithril-client-cli/src/commands/cardano_db/shared_steps.rs b/mithril-client-cli/src/commands/cardano_db/shared_steps.rs
index 554df3f8aa7..85fb03a9f43 100644
--- a/mithril-client-cli/src/commands/cardano_db/shared_steps.rs
+++ b/mithril-client-cli/src/commands/cardano_db/shared_steps.rs
@@ -221,7 +221,7 @@ mod tests {
         MithrilCertificateMetadata,
         common::{CardanoDbBeacon, ProtocolMessagePartKey, SignedEntityType},
     };
-    use mithril_common::test_utils::TempDir;
+    use mithril_common::test_utils::{TempDir, double::Dummy};
 
     use crate::utils::ProgressOutputType;
 
diff --git a/mithril-client/Cargo.toml b/mithril-client/Cargo.toml
index fc9cb6b6f0c..aff5e602ffe 100644
--- a/mithril-client/Cargo.toml
+++ b/mithril-client/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-client"
-version = "0.12.22"
+version = "0.12.23"
 description = "Mithril client library"
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-client/src/cardano_database_client/api.rs b/mithril-client/src/cardano_database_client/api.rs
index beec035e4db..a5bd0cbf5b5 100644
--- a/mithril-client/src/cardano_database_client/api.rs
+++ b/mithril-client/src/cardano_database_client/api.rs
@@ -249,6 +249,7 @@ pub(crate) mod test_dependency_injector {
     }
 
     mod tests {
+        use mithril_common::test_utils::double::Dummy;
         use mockall::predicate;
 
         use crate::aggregator_client::AggregatorRequest;
diff --git a/mithril-client/src/cardano_database_client/download_unpack/internal_downloader.rs b/mithril-client/src/cardano_database_client/download_unpack/internal_downloader.rs
index 4a1f1a72d66..6b0e3988d12 100644
--- a/mithril-client/src/cardano_database_client/download_unpack/internal_downloader.rs
+++ b/mithril-client/src/cardano_database_client/download_unpack/internal_downloader.rs
@@ -275,7 +275,7 @@ mod tests {
     use mithril_common::{
         entities::{CardanoDbBeacon, Epoch, MultiFilesUri, TemplateUri},
         messages::CardanoDatabaseSnapshotMessage as CardanoDatabaseSnapshot,
-        test_utils::temp_dir_create,
+        test_utils::{double::Dummy, temp_dir_create},
     };
 
     use crate::cardano_database_client::CardanoDatabaseClientDependencyInjector;
diff --git a/mithril-client/src/cardano_database_client/fetch.rs b/mithril-client/src/cardano_database_client/fetch.rs
index 63009829c97..e667340ae9f 100644
--- a/mithril-client/src/cardano_database_client/fetch.rs
+++ b/mithril-client/src/cardano_database_client/fetch.rs
@@ -66,6 +66,7 @@ mod tests {
     use mockall::predicate::eq;
 
     use mithril_common::entities::{CardanoDbBeacon, Epoch};
+    use mithril_common::test_utils::double::Dummy;
 
     use crate::cardano_database_client::CardanoDatabaseClientDependencyInjector;
 
diff --git a/mithril-client/src/cardano_database_client/proving.rs b/mithril-client/src/cardano_database_client/proving.rs
index c6aac350a2a..711811c9cf0 100644
--- a/mithril-client/src/cardano_database_client/proving.rs
+++ b/mithril-client/src/cardano_database_client/proving.rs
@@ -180,7 +180,7 @@ mod tests {
     use mithril_common::{
         entities::{CardanoDbBeacon, Epoch, HexEncodedDigest},
         messages::CardanoDatabaseDigestListItemMessage,
-        test_utils::TempDir,
+        test_utils::{TempDir, double::Dummy},
     };
 
     use crate::{
diff --git a/mithril-client/src/cardano_transaction_client.rs b/mithril-client/src/cardano_transaction_client.rs
index 8b8cd0c5381..c488ba55c0f 100644
--- a/mithril-client/src/cardano_transaction_client.rs
+++ b/mithril-client/src/cardano_transaction_client.rs
@@ -164,6 +164,8 @@ mod tests {
     use chrono::{DateTime, Utc};
     use mockall::predicate::eq;
 
+    use mithril_common::test_utils::double::Dummy;
+
     use crate::aggregator_client::{AggregatorClientError, MockAggregatorClient};
     use crate::common::{BlockNumber, Epoch};
     use crate::{
diff --git a/mithril-client/src/certificate_client/fetch.rs b/mithril-client/src/certificate_client/fetch.rs
index 132b6d0b28e..f4296bb74e9 100644
--- a/mithril-client/src/certificate_client/fetch.rs
+++ b/mithril-client/src/certificate_client/fetch.rs
@@ -105,7 +105,7 @@ impl CertificateRetriever for InternalCertificateRetriever {
 
 #[cfg(test)]
 mod tests {
-    use mithril_common::test_utils::fake_data;
+    use mithril_common::test_utils::{double::Dummy, fake_data};
 
     use crate::certificate_client::tests_utils::CertificateClientTestBuilder;
 
diff --git a/mithril-client/src/snapshot_client.rs b/mithril-client/src/snapshot_client.rs
index 58a7489cec0..09e189a24d1 100644
--- a/mithril-client/src/snapshot_client.rs
+++ b/mithril-client/src/snapshot_client.rs
@@ -481,9 +481,8 @@ mod tests {
     };
 
     use mithril_cardano_node_internal_database::IMMUTABLE_DIR;
-    use mithril_common::{
-        assert_dir_eq, crypto_helper::ManifestSigner, temp_dir_create, test_utils::fake_keys,
-    };
+    use mithril_common::test_utils::{double::Dummy, fake_keys};
+    use mithril_common::{assert_dir_eq, crypto_helper::ManifestSigner, temp_dir_create};
 
     use super::*;
 
diff --git a/mithril-client/tests/extensions/fake_aggregator/cardano_db_v1.rs b/mithril-client/tests/extensions/fake_aggregator/cardano_db_v1.rs
index 1c4fe08c900..d162821ab84 100644
--- a/mithril-client/tests/extensions/fake_aggregator/cardano_db_v1.rs
+++ b/mithril-client/tests/extensions/fake_aggregator/cardano_db_v1.rs
@@ -7,7 +7,7 @@ use mithril_cardano_node_internal_database::test::DummyCardanoDb;
 use mithril_client::{MessageBuilder, MithrilCertificate, Snapshot, SnapshotListItem};
 use mithril_common::crypto_helper::ManifestVerifierSecretKey;
 use mithril_common::entities::{CardanoDbBeacon, CompressionAlgorithm, SignedEntityType};
-use mithril_common::test_utils::fake_data;
+use mithril_common::test_utils::{double::Dummy, fake_data};
 
 use crate::extensions::{routes, snapshot_archives};
 
diff --git a/mithril-client/tests/extensions/fake_aggregator/cardano_db_v2.rs b/mithril-client/tests/extensions/fake_aggregator/cardano_db_v2.rs
index 4c2a8885b22..641528179ae 100644
--- a/mithril-client/tests/extensions/fake_aggregator/cardano_db_v2.rs
+++ b/mithril-client/tests/extensions/fake_aggregator/cardano_db_v2.rs
@@ -17,7 +17,7 @@ use mithril_client::{
     CardanoDatabaseSnapshot, CardanoDatabaseSnapshotListItem, MithrilCertificate,
 };
 use mithril_common::crypto_helper::ManifestVerifierSecretKey;
-use mithril_common::test_utils::fake_data;
+use mithril_common::test_utils::{double::Dummy, fake_data};
 
 use crate::extensions::{routes, snapshot_archives};
 
diff --git a/mithril-client/tests/extensions/fake_aggregator/cardano_transaction.rs b/mithril-client/tests/extensions/fake_aggregator/cardano_transaction.rs
index 16c6e7f6362..d55c4fd5073 100644
--- a/mithril-client/tests/extensions/fake_aggregator/cardano_transaction.rs
+++ b/mithril-client/tests/extensions/fake_aggregator/cardano_transaction.rs
@@ -1,6 +1,7 @@
 use mithril_client::common::{BlockNumber, ProtocolMessagePartKey};
 use mithril_client::{CardanoTransactionsProofs, CardanoTransactionsSetProof, MithrilCertificate};
 use mithril_common::crypto_helper::{MKProof, ProtocolMkProof};
+use mithril_common::test_utils::double::Dummy;
 
 use crate::extensions::routes;
 
diff --git a/mithril-client/tests/extensions/fake_aggregator/certificate.rs b/mithril-client/tests/extensions/fake_aggregator/certificate.rs
index 4ab94b4a231..3794e5a8df9 100644
--- a/mithril-client/tests/extensions/fake_aggregator/certificate.rs
+++ b/mithril-client/tests/extensions/fake_aggregator/certificate.rs
@@ -1,4 +1,5 @@
 use mithril_client::{MithrilCertificate, MithrilCertificateListItem};
+use mithril_common::test_utils::double::Dummy;
 
 use crate::extensions::routes;
 
diff --git a/mithril-client/tests/extensions/fake_aggregator/mithril_stake_distribution.rs b/mithril-client/tests/extensions/fake_aggregator/mithril_stake_distribution.rs
index 2ca6f1c1e6e..3a28e2750a5 100644
--- a/mithril-client/tests/extensions/fake_aggregator/mithril_stake_distribution.rs
+++ b/mithril-client/tests/extensions/fake_aggregator/mithril_stake_distribution.rs
@@ -1,6 +1,7 @@
 use mithril_client::{
     MessageBuilder, MithrilCertificate, MithrilStakeDistribution, MithrilStakeDistributionListItem,
 };
+use mithril_common::test_utils::double::Dummy;
 
 use crate::extensions::routes;
 
diff --git a/mithril-common/Cargo.toml b/mithril-common/Cargo.toml
index 237dafa69d4..1409e5f2489 100644
--- a/mithril-common/Cargo.toml
+++ b/mithril-common/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-common"
-version = "0.6.9"
+version = "0.6.10"
 description = "Common types, interfaces, and utilities for Mithril nodes."
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-common/src/entities/cardano_chain_point.rs b/mithril-common/src/entities/cardano_chain_point.rs
index b1409dd06c8..332a3963748 100644
--- a/mithril-common/src/entities/cardano_chain_point.rs
+++ b/mithril-common/src/entities/cardano_chain_point.rs
@@ -34,17 +34,6 @@ impl ChainPoint {
             block_hash: block_hash.into(),
         }
     }
-
-    cfg_test_tools! {
-        /// Create a dummy ChainPoint
-        pub fn dummy() -> Self {
-            Self {
-                slot_number: SlotNumber(100),
-                block_number: BlockNumber(0),
-                block_hash: "block_hash-50".to_string(),
-            }
-        }
-    }
 }
 
 impl Display for ChainPoint {
diff --git a/mithril-common/src/entities/cardano_transactions_set_proof.rs b/mithril-common/src/entities/cardano_transactions_set_proof.rs
index fc814fccf8e..4ec4a1bbc07 100644
--- a/mithril-common/src/entities/cardano_transactions_set_proof.rs
+++ b/mithril-common/src/entities/cardano_transactions_set_proof.rs
@@ -53,20 +53,6 @@ impl CardanoTransactionsSetProof {
     }
 
     cfg_test_tools! {
-        /// Retrieve a dummy proof (for test only)
-        pub fn dummy() -> Self {
-            let leaves = vec![
-                (BlockNumber(0), "tx-1".to_string()),
-                (BlockNumber(1), "tx-2".to_string()),
-                (BlockNumber(1), "tx-3".to_string()),
-                (BlockNumber(10), "tx-4".to_string()),
-                (BlockNumber(20), "tx-5".to_string()),
-                (BlockNumber(22), "tx-6".to_string()),
-            ];
-
-            Self::from_leaves::<MKTreeStoreInMemory>(&leaves).unwrap()
-        }
-
         /// Helper to create a proof from a list of leaves
         pub fn from_leaves<S: MKTreeStorer>(leaves: &[(BlockNumber, TransactionHash)]) -> StdResult<Self> {
             let transactions_hashes: Vec<TransactionHash> =
diff --git a/mithril-common/src/entities/signed_entity_config.rs b/mithril-common/src/entities/signed_entity_config.rs
index 6e522c2baa2..641a1c66f78 100644
--- a/mithril-common/src/entities/signed_entity_config.rs
+++ b/mithril-common/src/entities/signed_entity_config.rs
@@ -19,16 +19,6 @@ pub struct SignedEntityConfig {
 }
 
 impl SignedEntityConfig {
-    cfg_test_tools! {
-        /// Create a dummy SignedEntityConfig
-        pub fn dummy() -> Self {
-            Self {
-                allowed_discriminants: SignedEntityTypeDiscriminants::all(),
-                cardano_transactions_signing_config: CardanoTransactionsSigningConfig::dummy(),
-            }
-        }
-    }
-
     /// Default allowed discriminants
     ///
     /// Appended to the allowed discriminants in the configuration.
@@ -131,13 +121,6 @@ impl CardanoTransactionsSigningConfig {
             }
         }
 
-        /// Create a dummy config
-        pub fn dummy() -> Self {
-            Self {
-                security_parameter: BlockNumber(0),
-                step: BlockNumber(15),
-            }
-        }
     }
 
     /// Compute the block number to be signed based on the chain tip block number.
@@ -174,7 +157,7 @@ mod tests {
     use crate::entities::{
         CardanoDbBeacon, ChainPoint, Epoch, SignedEntityType, SlotNumber, TimePoint,
     };
-    use crate::test_utils::fake_data;
+    use crate::test_utils::{double::Dummy, fake_data};
 
     use super::*;
 
diff --git a/mithril-common/src/entities/signed_entity_type.rs b/mithril-common/src/entities/signed_entity_type.rs
index 6c15eb4e80b..5f3c0ed82eb 100644
--- a/mithril-common/src/entities/signed_entity_type.rs
+++ b/mithril-common/src/entities/signed_entity_type.rs
@@ -67,11 +67,6 @@ pub enum SignedEntityType {
 }
 
 impl SignedEntityType {
-    /// Retrieve a dummy entity type (for test only)
-    pub fn dummy() -> Self {
-        Self::MithrilStakeDistribution(Epoch(5))
-    }
-
     /// Create a new signed entity type for a genesis certificate (a [Self::MithrilStakeDistribution])
     pub fn genesis(epoch: Epoch) -> Self {
         Self::MithrilStakeDistribution(epoch)
diff --git a/mithril-common/src/entities/supported_era.rs b/mithril-common/src/entities/supported_era.rs
index dcd87d2a614..60a42ac024a 100644
--- a/mithril-common/src/entities/supported_era.rs
+++ b/mithril-common/src/entities/supported_era.rs
@@ -17,18 +17,16 @@ impl SupportedEra {
     pub fn eras() -> Vec<Self> {
         Self::iter().collect()
     }
-
-    /// Retrieve a dummy era (for test only)
-    pub fn dummy() -> Self {
-        Self::eras().first().unwrap().to_owned()
-    }
 }
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use std::str::FromStr;
 
+    use crate::test_utils::double::Dummy;
+
+    use super::*;
+
     #[test]
     fn correct_number_of_eras() {
         let total_eras = SupportedEra::eras().len();
diff --git a/mithril-common/src/entities/time_point.rs b/mithril-common/src/entities/time_point.rs
index 74fcf1db11d..494b5053a99 100644
--- a/mithril-common/src/entities/time_point.rs
+++ b/mithril-common/src/entities/time_point.rs
@@ -30,13 +30,6 @@ impl TimePoint {
             chain_point,
         }
     }
-
-    cfg_test_tools! {
-        /// Create a dummy TimePoint
-        pub fn dummy() -> Self {
-            Self::new(10, 100, ChainPoint::dummy())
-        }
-    }
 }
 
 impl PartialOrd for TimePoint {
diff --git a/mithril-common/src/messages/aggregator_features.rs b/mithril-common/src/messages/aggregator_features.rs
index 630b4b3b83b..3bcd8474755 100644
--- a/mithril-common/src/messages/aggregator_features.rs
+++ b/mithril-common/src/messages/aggregator_features.rs
@@ -17,22 +17,6 @@ pub struct AggregatorFeaturesMessage {
     pub capabilities: AggregatorCapabilities,
 }
 
-impl AggregatorFeaturesMessage {
-    /// Create a dummy AggregatorFeaturesMessage
-    pub fn dummy() -> Self {
-        AggregatorFeaturesMessage {
-            open_api_version: "0.0.1".to_string(),
-            documentation_url: "https://example.com".to_string(),
-            capabilities: AggregatorCapabilities {
-                signed_entity_types: BTreeSet::from([
-                    SignedEntityTypeDiscriminants::MithrilStakeDistribution,
-                ]),
-                cardano_transactions_prover: None,
-            },
-        }
-    }
-}
-
 /// Capabilities of an Aggregator
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub struct AggregatorCapabilities {
diff --git a/mithril-common/src/messages/cardano_database.rs b/mithril-common/src/messages/cardano_database.rs
index 3cb3c03b019..36472326d3d 100644
--- a/mithril-common/src/messages/cardano_database.rs
+++ b/mithril-common/src/messages/cardano_database.rs
@@ -4,8 +4,8 @@ use serde::{Deserialize, Serialize};
 
 use crate::StdResult;
 use crate::entities::{
-    AncillaryLocation, AncillaryLocations, CardanoDbBeacon, CompressionAlgorithm, DigestLocation,
-    DigestsLocations, Epoch, ImmutablesLocation, ImmutablesLocations, MultiFilesUri, TemplateUri,
+    AncillaryLocation, AncillaryLocations, CardanoDbBeacon, DigestLocation, DigestsLocations,
+    ImmutablesLocation, ImmutablesLocations,
 };
 
 /// The message part that represents the locations of the Cardano database digests.
@@ -156,61 +156,10 @@ pub struct CardanoDatabaseSnapshotMessage {
     pub created_at: DateTime<Utc>,
 }
 
-impl CardanoDatabaseSnapshotMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        Self {
-            hash: "d4071d518a3ace0f6c04a9c0745b9e9560e3e2af1b373bafc4e0398423e9abfb".to_string(),
-            merkle_root: "c8224920b9f5ad7377594eb8a15f34f08eb3103cc5241d57cafc5638403ec7c6"
-                .to_string(),
-            network: "preview".to_string(),
-            beacon: CardanoDbBeacon {
-                epoch: Epoch(123),
-                immutable_file_number: 2345,
-            },
-            certificate_hash: "f6c01b373bafc4e039844071d5da3ace4a9c0745b9e9560e3e2af01823e9abfb"
-                .to_string(),
-            total_db_size_uncompressed: 800796318,
-            created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                .unwrap()
-                .with_timezone(&Utc),
-            digests: DigestsMessagePart {
-                size_uncompressed: 1024,
-                locations: vec![DigestLocation::Aggregator {
-                    uri: "https://host-1/digest-1".to_string(),
-                }],
-            },
-            immutables: ImmutablesMessagePart {
-                average_size_uncompressed: 512,
-                locations: vec![
-                    ImmutablesLocation::CloudStorage {
-                        uri: MultiFilesUri::Template(TemplateUri(
-                            "https://host-1/immutables-2".to_string(),
-                        )),
-                        compression_algorithm: Some(CompressionAlgorithm::Gzip),
-                    },
-                    ImmutablesLocation::CloudStorage {
-                        uri: MultiFilesUri::Template(TemplateUri(
-                            "https://host-2/immutables-2".to_string(),
-                        )),
-                        compression_algorithm: Some(CompressionAlgorithm::Gzip),
-                    },
-                ],
-            },
-            ancillary: AncillaryMessagePart {
-                size_uncompressed: 2048,
-                locations: vec![AncillaryLocation::CloudStorage {
-                    uri: "https://host-1/ancillary-3".to_string(),
-                    compression_algorithm: Some(CompressionAlgorithm::Gzip),
-                }],
-            },
-            cardano_node_version: "0.0.1".to_string(),
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
+    use crate::entities::{CompressionAlgorithm, Epoch, MultiFilesUri, TemplateUri};
+
     use super::*;
 
     const CURRENT_JSON: &str = r#"
diff --git a/mithril-common/src/messages/cardano_database_digest_list.rs b/mithril-common/src/messages/cardano_database_digest_list.rs
index 4cafcfb0bf1..dd567f0bb2e 100644
--- a/mithril-common/src/messages/cardano_database_digest_list.rs
+++ b/mithril-common/src/messages/cardano_database_digest_list.rs
@@ -15,16 +15,6 @@ pub struct CardanoDatabaseDigestListItemMessage {
     pub digest: HexEncodedDigest,
 }
 
-impl CardanoDatabaseDigestListItemMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        Self {
-            immutable_file_name: "06685.chunk".to_string(),
-            digest: "0af556ab2620dd9363bf76963a231abe8948a500ea6be31b131d87907ab09b1e".to_string(),
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/mithril-common/src/messages/cardano_database_immutable_files_restored.rs b/mithril-common/src/messages/cardano_database_immutable_files_restored.rs
index 9918bdb2ae5..135f5528a4a 100644
--- a/mithril-common/src/messages/cardano_database_immutable_files_restored.rs
+++ b/mithril-common/src/messages/cardano_database_immutable_files_restored.rs
@@ -7,15 +7,6 @@ pub struct CardanoDatabaseImmutableFilesRestoredMessage {
     pub nb_immutable_files: u32,
 }
 
-impl CardanoDatabaseImmutableFilesRestoredMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        Self {
-            nb_immutable_files: 34,
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/mithril-common/src/messages/cardano_database_list.rs b/mithril-common/src/messages/cardano_database_list.rs
index 292795493a9..2d21274f32b 100644
--- a/mithril-common/src/messages/cardano_database_list.rs
+++ b/mithril-common/src/messages/cardano_database_list.rs
@@ -1,7 +1,7 @@
 use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 
-use crate::entities::{CardanoDbBeacon, Epoch};
+use crate::entities::CardanoDbBeacon;
 
 /// Message structure of a Cardano database snapshot list
 pub type CardanoDatabaseSnapshotListMessage = Vec<CardanoDatabaseSnapshotListItemMessage>;
@@ -31,30 +31,10 @@ pub struct CardanoDatabaseSnapshotListItemMessage {
     pub created_at: DateTime<Utc>,
 }
 
-impl CardanoDatabaseSnapshotListItemMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        Self {
-            hash: "d4071d518a3ace0f6c04a9c0745b9e9560e3e2af1b373bafc4e0398423e9abfb".to_string(),
-            merkle_root: "c8224920b9f5ad7377594eb8a15f34f08eb3103cc5241d57cafc5638403ec7c6"
-                .to_string(),
-            beacon: CardanoDbBeacon {
-                epoch: Epoch(123),
-                immutable_file_number: 2345,
-            },
-            certificate_hash: "f6c01b373bafc4e039844071d5da3ace4a9c0745b9e9560e3e2af01823e9abfb"
-                .to_string(),
-            total_db_size_uncompressed: 800796318,
-            created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                .unwrap()
-                .with_timezone(&Utc),
-            cardano_node_version: "0.0.1".to_string(),
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
+    use crate::entities::Epoch;
+
     use super::*;
 
     const CURRENT_JSON: &str = r#"
diff --git a/mithril-common/src/messages/cardano_stake_distribution.rs b/mithril-common/src/messages/cardano_stake_distribution.rs
index 4a46c9c4695..70257489a0e 100644
--- a/mithril-common/src/messages/cardano_stake_distribution.rs
+++ b/mithril-common/src/messages/cardano_stake_distribution.rs
@@ -24,25 +24,6 @@ pub struct CardanoStakeDistributionMessage {
     pub created_at: DateTime<Utc>,
 }
 
-impl CardanoStakeDistributionMessage {
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            Self {
-                epoch: Epoch(1),
-                hash: "hash-123".to_string(),
-                certificate_hash: "cert-hash-123".to_string(),
-                stake_distribution: StakeDistribution::from([
-                    ("pool-123".to_string(), 1000),
-                ]),
-                created_at: DateTime::parse_from_rfc3339("2024-07-29T16:15:05.618857482Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-            }
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/mithril-common/src/messages/cardano_stake_distribution_list.rs b/mithril-common/src/messages/cardano_stake_distribution_list.rs
index 01e02a4c2ad..6f239b2dc96 100644
--- a/mithril-common/src/messages/cardano_stake_distribution_list.rs
+++ b/mithril-common/src/messages/cardano_stake_distribution_list.rs
@@ -22,20 +22,6 @@ pub struct CardanoStakeDistributionListItemMessage {
     pub created_at: DateTime<Utc>,
 }
 
-impl CardanoStakeDistributionListItemMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        Self {
-            epoch: Epoch(1),
-            hash: "hash-123".to_string(),
-            certificate_hash: "certificate-hash-123".to_string(),
-            created_at: DateTime::parse_from_rfc3339("2024-07-29T16:15:05.618857482Z")
-                .unwrap()
-                .with_timezone(&Utc),
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/mithril-common/src/messages/cardano_transaction_snapshot.rs b/mithril-common/src/messages/cardano_transaction_snapshot.rs
index 6942cc57aa7..0c5db3716ae 100644
--- a/mithril-common/src/messages/cardano_transaction_snapshot.rs
+++ b/mithril-common/src/messages/cardano_transaction_snapshot.rs
@@ -26,24 +26,6 @@ pub struct CardanoTransactionSnapshotMessage {
     pub created_at: DateTime<Utc>,
 }
 
-impl CardanoTransactionSnapshotMessage {
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            Self {
-                merkle_root: "mkroot-123".to_string(),
-                epoch: Epoch(10),
-                block_number: BlockNumber(100),
-                hash: "hash-123".to_string(),
-                certificate_hash: "cert-hash-123".to_string(),
-                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-            }
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/mithril-common/src/messages/cardano_transaction_snapshot_list.rs b/mithril-common/src/messages/cardano_transaction_snapshot_list.rs
index aae811d5567..0587331aeff 100644
--- a/mithril-common/src/messages/cardano_transaction_snapshot_list.rs
+++ b/mithril-common/src/messages/cardano_transaction_snapshot_list.rs
@@ -28,24 +28,6 @@ pub struct CardanoTransactionSnapshotListItemMessage {
     pub created_at: DateTime<Utc>,
 }
 
-impl CardanoTransactionSnapshotListItemMessage {
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            Self {
-                merkle_root: "mkroot-123".to_string(),
-                epoch: Epoch(10),
-                block_number: BlockNumber(100),
-                hash: "hash-123".to_string(),
-                certificate_hash: "cert-hash-123".to_string(),
-                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-            }
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/mithril-common/src/messages/cardano_transactions_proof.rs b/mithril-common/src/messages/cardano_transactions_proof.rs
index 0ff7a654da5..a3b926b87bb 100644
--- a/mithril-common/src/messages/cardano_transactions_proof.rs
+++ b/mithril-common/src/messages/cardano_transactions_proof.rs
@@ -181,13 +181,15 @@ impl CardanoTransactionsProofsMessage {
 
 #[cfg(test)]
 mod tests {
+    use std::sync::Arc;
+
     use crate::crypto_helper::{MKMap, MKMapNode, MKProof, MKTreeStoreInMemory};
     use crate::entities::{BlockNumber, BlockRange, CardanoTransaction, SlotNumber};
     use crate::signable_builder::{
         CardanoTransactionsSignableBuilder, MockBlockRangeRootRetriever, MockTransactionsImporter,
         SignableBuilder,
     };
-    use std::sync::Arc;
+    use crate::test_utils::double::Dummy;
 
     use super::*;
 
diff --git a/mithril-common/src/messages/certificate.rs b/mithril-common/src/messages/certificate.rs
index 0bf7193b0ca..3e10555ea51 100644
--- a/mithril-common/src/messages/certificate.rs
+++ b/mithril-common/src/messages/certificate.rs
@@ -9,8 +9,6 @@ use crate::entities::{
     SignedEntityType,
 };
 use crate::messages::CertificateMetadataMessagePart;
-#[cfg(any(test, feature = "test_tools"))]
-use crate::{entities::ProtocolMessagePartKey, test_utils::fake_keys};
 
 /// Message structure of a certificate
 #[derive(Clone, PartialEq, Serialize, Deserialize)]
@@ -60,35 +58,6 @@ pub struct CertificateMessage {
 }
 
 impl CertificateMessage {
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            let mut protocol_message = ProtocolMessage::new();
-            protocol_message.set_message_part(
-                ProtocolMessagePartKey::SnapshotDigest,
-                "snapshot-digest-123".to_string(),
-            );
-            protocol_message.set_message_part(
-                ProtocolMessagePartKey::NextAggregateVerificationKey,
-                fake_keys::aggregate_verification_key()[1].to_owned(),
-            );
-            let epoch = Epoch(10);
-
-            Self {
-                hash: "hash".to_string(),
-                previous_hash: "previous_hash".to_string(),
-                epoch,
-                signed_entity_type: SignedEntityType::MithrilStakeDistribution(epoch),
-                metadata: CertificateMetadataMessagePart::dummy(),
-                protocol_message: protocol_message.clone(),
-                signed_message: "signed_message".to_string(),
-                aggregate_verification_key: fake_keys::aggregate_verification_key()[0].to_owned(),
-                multi_signature: fake_keys::multi_signature()[0].to_owned(),
-                genesis_signature: String::new(),
-            }
-        }
-    }
-
     /// Check that the certificate signed message match the given protocol message.
     pub fn match_message(&self, message: &ProtocolMessage) -> bool {
         message.compute_hash() == self.signed_message
@@ -235,7 +204,9 @@ impl TryFrom<Certificate> for CertificateMessage {
 mod tests {
     use chrono::{DateTime, Utc};
 
-    use crate::entities::{CardanoDbBeacon, ProtocolParameters, StakeDistributionParty};
+    use crate::entities::{
+        CardanoDbBeacon, ProtocolMessagePartKey, ProtocolParameters, StakeDistributionParty,
+    };
 
     use super::*;
 
diff --git a/mithril-common/src/messages/certificate_list.rs b/mithril-common/src/messages/certificate_list.rs
index f805a3bb36c..67f7d6f0af7 100644
--- a/mithril-common/src/messages/certificate_list.rs
+++ b/mithril-common/src/messages/certificate_list.rs
@@ -3,8 +3,7 @@ use serde::{Deserialize, Serialize};
 use std::fmt::{Debug, Formatter};
 
 use crate::entities::{
-    Epoch, ProtocolMessage, ProtocolMessagePartKey, ProtocolParameters, ProtocolVersion,
-    SignedEntityType,
+    Epoch, ProtocolMessage, ProtocolParameters, ProtocolVersion, SignedEntityType,
 };
 
 /// Message structure of a certificate list
@@ -82,44 +81,6 @@ pub struct CertificateListItemMessage {
     pub aggregate_verification_key: String,
 }
 
-impl CertificateListItemMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        let mut protocol_message = ProtocolMessage::new();
-        protocol_message.set_message_part(
-            ProtocolMessagePartKey::SnapshotDigest,
-            "snapshot-digest-123".to_string(),
-        );
-        protocol_message.set_message_part(
-            ProtocolMessagePartKey::NextAggregateVerificationKey,
-            "next-avk-123".to_string(),
-        );
-        let epoch = Epoch(10);
-
-        Self {
-            hash: "hash".to_string(),
-            previous_hash: "previous_hash".to_string(),
-            epoch,
-            signed_entity_type: SignedEntityType::MithrilStakeDistribution(epoch),
-            metadata: CertificateListItemMessageMetadata {
-                network: "testnet".to_string(),
-                protocol_version: "0.1.0".to_string(),
-                protocol_parameters: ProtocolParameters::new(1000, 100, 0.123),
-                initiated_at: DateTime::parse_from_rfc3339("2024-02-12T13:11:47Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-                sealed_at: DateTime::parse_from_rfc3339("2024-02-12T13:12:57Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-                total_signers: 2,
-            },
-            protocol_message: protocol_message.clone(),
-            signed_message: "signed_message".to_string(),
-            aggregate_verification_key: "aggregate_verification_key".to_string(),
-        }
-    }
-}
-
 impl Debug for CertificateListItemMessage {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         let should_be_exhaustive = f.alternate();
@@ -153,7 +114,7 @@ impl Debug for CertificateListItemMessage {
 
 #[cfg(test)]
 mod tests {
-    use crate::entities::CardanoDbBeacon;
+    use crate::entities::{CardanoDbBeacon, ProtocolMessagePartKey};
 
     use super::*;
 
diff --git a/mithril-common/src/messages/epoch_settings.rs b/mithril-common/src/messages/epoch_settings.rs
index ae952ea5890..1860dd8daf6 100644
--- a/mithril-common/src/messages/epoch_settings.rs
+++ b/mithril-common/src/messages/epoch_settings.rs
@@ -27,26 +27,6 @@ pub struct EpochSettingsMessage {
     pub next_cardano_transactions_signing_config: Option<CardanoTransactionsSigningConfig>,
 }
 
-impl EpochSettingsMessage {
-    cfg_test_tools! {
-        /// Dummy instance for test purposes.
-        pub fn dummy() -> Self {
-            Self {
-                epoch: Epoch(10),
-                signer_registration_protocol_parameters: ProtocolParameters {
-                    k: 5,
-                    m: 100,
-                    phi_f: 0.65,
-                },
-                current_signers: [SignerMessagePart::dummy()].to_vec(),
-                next_signers: [SignerMessagePart::dummy()].to_vec(),
-                cardano_transactions_signing_config: Some(CardanoTransactionsSigningConfig::dummy()),
-                next_cardano_transactions_signing_config: Some(CardanoTransactionsSigningConfig::dummy()),
-            }
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
 
diff --git a/mithril-common/src/messages/message_parts/cardano_transactions_set_proof.rs b/mithril-common/src/messages/message_parts/cardano_transactions_set_proof.rs
index 7d99ebc250e..296c80064a5 100644
--- a/mithril-common/src/messages/message_parts/cardano_transactions_set_proof.rs
+++ b/mithril-common/src/messages/message_parts/cardano_transactions_set_proof.rs
@@ -19,15 +19,6 @@ pub struct CardanoTransactionsSetProofMessagePart {
     pub proof: HexEncodedKey,
 }
 
-impl CardanoTransactionsSetProofMessagePart {
-    cfg_test_tools! {
-        /// Retrieve a dummy proof (for test only)
-        pub fn dummy() -> Self {
-            crate::entities::CardanoTransactionsSetProof::dummy().try_into().unwrap()
-        }
-    }
-}
-
 impl TryFrom<CardanoTransactionsSetProof> for CardanoTransactionsSetProofMessagePart {
     type Error = StdError;
 
diff --git a/mithril-common/src/messages/message_parts/certificate_metadata.rs b/mithril-common/src/messages/message_parts/certificate_metadata.rs
index f4b503a50c6..1b106659cee 100644
--- a/mithril-common/src/messages/message_parts/certificate_metadata.rs
+++ b/mithril-common/src/messages/message_parts/certificate_metadata.rs
@@ -1,6 +1,6 @@
 use crate::entities::{ProtocolParameters, ProtocolVersion, StakeDistributionParty};
 
-use chrono::{DateTime, Duration, Utc};
+use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 
 /// CertificateMetadata represents the metadata associated to a Certificate
@@ -36,33 +36,6 @@ pub struct CertificateMetadataMessagePart {
     pub signers: Vec<StakeDistributionParty>,
 }
 
-impl CertificateMetadataMessagePart {
-    /// CertificateMetadata factory
-    pub fn dummy() -> Self {
-        let initiated_at = DateTime::parse_from_rfc3339("2024-02-12T13:11:47Z")
-            .unwrap()
-            .with_timezone(&Utc);
-
-        Self {
-            network: "testnet".to_string(),
-            protocol_version: "0.1.0".to_string(),
-            protocol_parameters: ProtocolParameters::new(1000, 100, 0.123),
-            initiated_at,
-            sealed_at: initiated_at + Duration::try_seconds(100).unwrap(),
-            signers: vec![
-                StakeDistributionParty {
-                    party_id: "1".to_string(),
-                    stake: 10,
-                },
-                StakeDistributionParty {
-                    party_id: "2".to_string(),
-                    stake: 20,
-                },
-            ],
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/mithril-common/src/messages/message_parts/signer.rs b/mithril-common/src/messages/message_parts/signer.rs
index 2f0849072d0..937595244cb 100644
--- a/mithril-common/src/messages/message_parts/signer.rs
+++ b/mithril-common/src/messages/message_parts/signer.rs
@@ -1,5 +1,7 @@
-#[cfg(any(test, feature = "test_tools"))]
-use crate::test_utils::fake_keys;
+use anyhow::Context;
+use serde::{Deserialize, Serialize};
+use std::fmt::{Debug, Formatter};
+
 use crate::{
     StdError, StdResult,
     crypto_helper::{KesPeriod, ProtocolOpCert, ProtocolSignerVerificationKeySignature},
@@ -8,9 +10,6 @@ use crate::{
         Signer, SignerWithStake, Stake,
     },
 };
-use anyhow::Context;
-use serde::{Deserialize, Serialize};
-use std::fmt::{Debug, Formatter};
 
 /// Signer with Stake Message
 #[derive(Clone, PartialEq, Eq, Default, Serialize, Deserialize)]
@@ -48,22 +47,6 @@ pub struct SignerWithStakeMessagePart {
 }
 
 impl SignerWithStakeMessagePart {
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            Self {
-                party_id: "pool1m8crhnqj5k2kyszf5j2scshupystyxc887zdfrpzh6ty6eun4fx".to_string(),
-                verification_key: fake_keys::signer_verification_key()[0].to_string(),
-                verification_key_signature: Some(
-                    fake_keys::signer_verification_key_signature()[0].to_string(),
-                ),
-                operational_certificate: Some(fake_keys::operational_certificate()[0].to_string()),
-                kes_period: Some(6),
-                stake: 234,
-            }
-        }
-    }
-
     /// Convert a set of signers into message parts
     pub fn from_signers(signers: Vec<SignerWithStake>) -> Vec<Self> {
         signers.into_iter().map(|signer| signer.into()).collect()
@@ -200,21 +183,6 @@ impl SignerMessagePart {
     pub fn from_signers(signers: Vec<Signer>) -> Vec<Self> {
         signers.into_iter().map(|signer| signer.into()).collect()
     }
-
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            Self {
-                party_id: "pool1m8crhnqj5k2kyszf5j2scshupystyxc887zdfrpzh6ty6eun4fx".to_string(),
-                verification_key: fake_keys::signer_verification_key()[0].to_string(),
-                verification_key_signature: Some(
-                    fake_keys::signer_verification_key_signature()[0].to_string(),
-                ),
-                operational_certificate: Some(fake_keys::operational_certificate()[0].to_string()),
-                kes_period: Some(6),
-            }
-        }
-    }
 }
 
 impl TryInto<Signer> for SignerMessagePart {
diff --git a/mithril-common/src/messages/mithril_stake_distribution.rs b/mithril-common/src/messages/mithril_stake_distribution.rs
index a0a95810fc2..7ba53c0f314 100644
--- a/mithril-common/src/messages/mithril_stake_distribution.rs
+++ b/mithril-common/src/messages/mithril_stake_distribution.rs
@@ -4,8 +4,6 @@ use serde::{Deserialize, Serialize};
 
 use crate::entities::Epoch;
 use crate::entities::ProtocolParameters;
-#[cfg(any(test, feature = "test_tools"))]
-use crate::test_utils::fake_data;
 
 use super::SignerWithStakeMessagePart;
 /// Message structure of a Mithril Stake Distribution
@@ -31,26 +29,10 @@ pub struct MithrilStakeDistributionMessage {
     pub protocol_parameters: ProtocolParameters,
 }
 
-impl MithrilStakeDistributionMessage {
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            Self {
-                epoch: Epoch(1),
-                signers_with_stake: vec![SignerWithStakeMessagePart::dummy()],
-                hash: "hash-123".to_string(),
-                certificate_hash: "cert-hash-123".to_string(),
-                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-                protocol_parameters: fake_data::protocol_parameters(),
-            }
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
+    use crate::test_utils::fake_data;
+
     use super::*;
 
     fn golden_message_current() -> MithrilStakeDistributionMessage {
diff --git a/mithril-common/src/messages/mithril_stake_distribution_list.rs b/mithril-common/src/messages/mithril_stake_distribution_list.rs
index 87d46b25d8d..c785d6e2bcf 100644
--- a/mithril-common/src/messages/mithril_stake_distribution_list.rs
+++ b/mithril-common/src/messages/mithril_stake_distribution_list.rs
@@ -22,20 +22,6 @@ pub struct MithrilStakeDistributionListItemMessage {
     pub created_at: DateTime<Utc>,
 }
 
-impl MithrilStakeDistributionListItemMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        Self {
-            epoch: Epoch(1),
-            hash: "hash-123".to_string(),
-            certificate_hash: "certificate-hash-123".to_string(),
-            created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                .unwrap()
-                .with_timezone(&Utc),
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/mithril-common/src/messages/register_signature.rs b/mithril-common/src/messages/register_signature.rs
index ee6a3598b98..b591ed3a6c8 100644
--- a/mithril-common/src/messages/register_signature.rs
+++ b/mithril-common/src/messages/register_signature.rs
@@ -9,9 +9,6 @@ use crate::{
     entities::{HexEncodedSingleSignature, LotteryIndex, PartyId, SignedEntityType},
 };
 
-#[cfg(any(test, feature = "test_tools"))]
-use crate::test_utils::fake_keys;
-
 /// Message structure to register single signature through HTTP.
 #[derive(Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct RegisterSignatureMessageHttp {
@@ -36,22 +33,6 @@ pub struct RegisterSignatureMessageHttp {
     pub signed_message: String,
 }
 
-impl RegisterSignatureMessageHttp {
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            use crate::entities::Epoch;
-            Self {
-                signed_entity_type: SignedEntityType::MithrilStakeDistribution(Epoch(5)),
-                party_id: "party_id".to_string(),
-                signature: fake_keys::single_signature()[0].to_string(),
-                won_indexes: vec![1, 3],
-                signed_message: "6a7e737c312972d2346b65ac3075696e04286d046dddaf8004121e3d5e27cc0d".to_string(),
-            }
-        }
-    }
-}
-
 impl Debug for RegisterSignatureMessageHttp {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         let is_pretty_printing = f.alternate();
@@ -82,17 +63,6 @@ pub struct RegisterSignatureMessageDmq {
 }
 
 impl RegisterSignatureMessageDmq {
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            use crate::entities::Epoch;
-            Self {
-                signed_entity_type: SignedEntityType::MithrilStakeDistribution(Epoch(5)),
-                signature: fake_keys::single_signature()[0].try_into().unwrap(),
-            }
-        }
-    }
-
     /// Convert a `RegisterSignatureMessageDmq` into bytes
     ///
     /// # Layout
diff --git a/mithril-common/src/messages/register_signer.rs b/mithril-common/src/messages/register_signer.rs
index b3b6890a261..6391508e919 100644
--- a/mithril-common/src/messages/register_signer.rs
+++ b/mithril-common/src/messages/register_signer.rs
@@ -41,26 +41,6 @@ pub struct RegisterSignerMessage {
     pub kes_period: Option<KesPeriod>,
 }
 
-impl RegisterSignerMessage {
-    cfg_test_tools! {
-        /// Return a dummy test entity (test-only).
-        pub fn dummy() -> Self {
-            use crate::test_utils::fake_keys;
-
-            Self {
-                epoch: Epoch(1),
-                party_id: "pool1m8crhnqj5k2kyszf5j2scshupystyxc887zdfrpzh6ty6eun4fx".to_string(),
-                verification_key: fake_keys::signer_verification_key()[0].to_string(),
-                verification_key_signature: Some(
-                    fake_keys::signer_verification_key_signature()[0].to_string(),
-                ),
-                operational_certificate: Some(fake_keys::operational_certificate()[0].to_string()),
-                kes_period: Some(6),
-            }
-        }
-    }
-}
-
 impl Debug for RegisterSignerMessage {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         let should_be_exhaustive = f.alternate();
diff --git a/mithril-common/src/messages/snapshot.rs b/mithril-common/src/messages/snapshot.rs
index be78ca68a99..ff6ba8abcaa 100644
--- a/mithril-common/src/messages/snapshot.rs
+++ b/mithril-common/src/messages/snapshot.rs
@@ -1,7 +1,7 @@
 use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 
-use crate::entities::{CardanoDbBeacon, CompressionAlgorithm, Epoch};
+use crate::entities::{CardanoDbBeacon, CompressionAlgorithm};
 
 /// Message structure of a snapshot
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
@@ -43,29 +43,6 @@ pub struct SnapshotMessage {
 }
 
 impl SnapshotMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        Self {
-            digest: "0b9f5ad7f33cc523775c82249294eb8a1541d54f08eb3107cafc5638403ec7c6".to_string(),
-            network: "preview".to_string(),
-            beacon: CardanoDbBeacon {
-                epoch: Epoch(86),
-                immutable_file_number: 1728,
-            },
-            certificate_hash: "d5daf6c03ace4a9c074e951844075b9b373bafc4e039160e3e2af01823e9abfb"
-                .to_string(),
-            size: 807803196,
-            ancillary_size: Some(123456789),
-            created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                .unwrap()
-                .with_timezone(&Utc),
-            locations: vec!["https://host/certificate.tar.gz".to_string()],
-            ancillary_locations: Some(vec!["https://host/ancillary.tar.gz".to_string()]),
-            compression_algorithm: CompressionAlgorithm::Gzip,
-            cardano_node_version: "0.0.1".to_string(),
-        }
-    }
-
     /// Compute the total size of the snapshot including ancillary files
     pub fn compute_total_size(&self) -> u64 {
         self.size + self.ancillary_size.unwrap_or(0)
@@ -74,6 +51,9 @@ impl SnapshotMessage {
 
 #[cfg(test)]
 mod tests {
+    use crate::entities::Epoch;
+    use crate::test_utils::double::Dummy;
+
     use super::*;
 
     #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
diff --git a/mithril-common/src/messages/snapshot_download.rs b/mithril-common/src/messages/snapshot_download.rs
index fd242744680..97757415c3f 100644
--- a/mithril-common/src/messages/snapshot_download.rs
+++ b/mithril-common/src/messages/snapshot_download.rs
@@ -1,6 +1,6 @@
 use serde::{Deserialize, Serialize};
 
-use crate::entities::{CardanoDbBeacon, CompressionAlgorithm, Epoch};
+use crate::entities::{CardanoDbBeacon, CompressionAlgorithm};
 
 /// Message structure of a snapshot
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
@@ -35,28 +35,10 @@ pub struct SnapshotDownloadMessage {
     pub cardano_node_version: String,
 }
 
-impl SnapshotDownloadMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        Self {
-            digest: "0b9f5ad7f33cc523775c82249294eb8a1541d54f08eb3107cafc5638403ec7c6".to_string(),
-            network: "preview".to_string(),
-            beacon: CardanoDbBeacon {
-                epoch: Epoch(86),
-                immutable_file_number: 1728,
-            },
-            size: 807803196,
-            ancillary_size: Some(123456789),
-            locations: vec!["https://host/certificate.tar.gz".to_string()],
-            ancillary_locations: Some(vec!["https://host/ancillary.tar.gz".to_string()]),
-            compression_algorithm: CompressionAlgorithm::Gzip,
-            cardano_node_version: "0.0.1".to_string(),
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
+    use crate::entities::Epoch;
+
     use super::*;
 
     #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
diff --git a/mithril-common/src/messages/snapshot_list.rs b/mithril-common/src/messages/snapshot_list.rs
index 6a5b9533e70..a3349fdee0e 100644
--- a/mithril-common/src/messages/snapshot_list.rs
+++ b/mithril-common/src/messages/snapshot_list.rs
@@ -1,7 +1,7 @@
 use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 
-use crate::entities::{CardanoDbBeacon, CompressionAlgorithm, Epoch};
+use crate::entities::{CardanoDbBeacon, CompressionAlgorithm};
 
 /// Message structure of a snapshot list
 pub type SnapshotListMessage = Vec<SnapshotListItemMessage>;
@@ -45,33 +45,10 @@ pub struct SnapshotListItemMessage {
     pub cardano_node_version: String,
 }
 
-impl SnapshotListItemMessage {
-    /// Return a dummy test entity (test-only).
-    pub fn dummy() -> Self {
-        Self {
-            digest: "0b9f5ad7f33cc523775c82249294eb8a1541d54f08eb3107cafc5638403ec7c6".to_string(),
-            network: "preview".to_string(),
-            beacon: CardanoDbBeacon {
-                epoch: Epoch(86),
-                immutable_file_number: 1728,
-            },
-            certificate_hash: "d5daf6c03ace4a9c074e951844075b9b373bafc4e039160e3e2af01823e9abfb"
-                .to_string(),
-            size: 807803196,
-            ancillary_size: Some(123456789),
-            created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                .unwrap()
-                .with_timezone(&Utc),
-            locations: vec!["https://host/certificate.tar.gz".to_string()],
-            ancillary_locations: Some(vec!["https://host/ancillary.tar.gz".to_string()]),
-            compression_algorithm: CompressionAlgorithm::default(),
-            cardano_node_version: "0.0.1".to_string(),
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
+    use crate::entities::Epoch;
+
     use super::*;
 
     pub type SnapshotListMessageUntilV0_1_47 = Vec<SnapshotListItemMessageUntilV0_1_47>;
diff --git a/mithril-common/src/signable_builder/signed_entity.rs b/mithril-common/src/signable_builder/signed_entity.rs
index 2084f1a80ee..834a6e78ed2 100644
--- a/mithril-common/src/signable_builder/signed_entity.rs
+++ b/mithril-common/src/signable_builder/signed_entity.rs
@@ -1,15 +1,7 @@
 use chrono::{DateTime, Utc};
 
 use super::Artifact;
-use crate::entities::{
-    CardanoStakeDistribution, CardanoTransactionsSnapshot, MithrilStakeDistribution,
-    SignedEntityType, Snapshot,
-};
-#[cfg(any(test, feature = "test_tools"))]
-use crate::test_utils::fake_data;
-
-#[cfg(any(test, feature = "test_tools"))]
-use crate::entities::{CardanoDbBeacon, Epoch};
+use crate::entities::SignedEntityType;
 
 /// Aggregate for signed entity
 #[derive(Debug, Clone)]
@@ -32,72 +24,3 @@ where
     /// Date and time when the signed_entity was created
     pub created_at: DateTime<Utc>,
 }
-
-impl SignedEntity<Snapshot> {
-    cfg_test_tools! {
-        /// Create a dummy [SignedEntity] for [Snapshot] entity
-        pub fn dummy() -> Self {
-            SignedEntity {
-                signed_entity_id: "snapshot-id-123".to_string(),
-                signed_entity_type: SignedEntityType::CardanoImmutableFilesFull(CardanoDbBeacon::default()),
-                certificate_id: "certificate-hash-123".to_string(),
-                artifact: fake_data::snapshots(1)[0].to_owned(),
-                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-            }
-        }
-    }
-}
-
-impl SignedEntity<MithrilStakeDistribution> {
-    cfg_test_tools! {
-        /// Create a dummy [SignedEntity] for [MithrilStakeDistribution] entity
-        pub fn dummy() -> Self {
-            SignedEntity {
-                signed_entity_id: "mithril-stake-distribution-id-123".to_string(),
-                signed_entity_type: SignedEntityType::MithrilStakeDistribution(Epoch(1)),
-                certificate_id: "certificate-hash-123".to_string(),
-                artifact: fake_data::mithril_stake_distributions(1)[0].to_owned(),
-                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-            }
-        }
-    }
-}
-
-impl SignedEntity<CardanoTransactionsSnapshot> {
-    cfg_test_tools! {
-        /// Create a dummy [SignedEntity] for [CardanoTransactionsSnapshot] entity
-        pub fn dummy() -> Self {
-            let block_number = crate::entities::BlockNumber(50);
-            SignedEntity {
-                signed_entity_id: "snapshot-id-123".to_string(),
-                signed_entity_type: SignedEntityType::CardanoTransactions(Epoch(5), block_number),
-                certificate_id: "certificate-hash-123".to_string(),
-                artifact: CardanoTransactionsSnapshot::new("mkroot123".to_string(), block_number),
-                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-            }
-        }
-    }
-}
-
-impl SignedEntity<CardanoStakeDistribution> {
-    cfg_test_tools! {
-        /// Create a dummy [SignedEntity] for [CardanoStakeDistribution] entity
-        pub fn dummy() -> Self {
-            SignedEntity {
-                signed_entity_id: "cardano-stake-distribution-id-123".to_string(),
-                signed_entity_type: SignedEntityType::CardanoStakeDistribution(Epoch(1)),
-                certificate_id: "certificate-hash-123".to_string(),
-                artifact: fake_data::cardano_stake_distributions(1)[0].to_owned(),
-                created_at: DateTime::parse_from_rfc3339("2024-07-29T16:15:05.618857482Z")
-                    .unwrap()
-                    .with_timezone(&Utc),
-            }
-        }
-    }
-}
diff --git a/mithril-common/src/test_utils/double/dummies.rs b/mithril-common/src/test_utils/double/dummies.rs
new file mode 100644
index 00000000000..f4ea1c42fc0
--- /dev/null
+++ b/mithril-common/src/test_utils/double/dummies.rs
@@ -0,0 +1,640 @@
+use chrono::{DateTime, Utc};
+
+use crate::test_utils::{double::Dummy, fake_data, fake_keys};
+
+mod entities {
+    use crate::crypto_helper::MKTreeStoreInMemory;
+    use crate::entities::*;
+
+    use super::*;
+
+    impl Dummy for ChainPoint {
+        /// Return a dummy [ChainPoint] (test-only).
+        fn dummy() -> Self {
+            Self {
+                slot_number: SlotNumber(100),
+                block_number: BlockNumber(0),
+                block_hash: "block_hash-50".to_string(),
+            }
+        }
+    }
+
+    impl Dummy for CardanoTransactionsSetProof {
+        /// Return a dummy [CardanoTransactionsSetProof] (test-only).
+        fn dummy() -> Self {
+            let leaves = vec![
+                (BlockNumber(0), "tx-1".to_string()),
+                (BlockNumber(1), "tx-2".to_string()),
+                (BlockNumber(1), "tx-3".to_string()),
+                (BlockNumber(10), "tx-4".to_string()),
+                (BlockNumber(20), "tx-5".to_string()),
+                (BlockNumber(22), "tx-6".to_string()),
+            ];
+
+            Self::from_leaves::<MKTreeStoreInMemory>(&leaves).unwrap()
+        }
+    }
+
+    impl Dummy for SignedEntityConfig {
+        /// Return a dummy [SignedEntityConfig] (test-only).
+        fn dummy() -> Self {
+            Self {
+                allowed_discriminants: SignedEntityTypeDiscriminants::all(),
+                cardano_transactions_signing_config: CardanoTransactionsSigningConfig::dummy(),
+            }
+        }
+    }
+
+    impl Dummy for CardanoTransactionsSigningConfig {
+        /// Return a dummy [CardanoTransactionsSigningConfig] (test-only).
+        fn dummy() -> Self {
+            Self {
+                security_parameter: BlockNumber(0),
+                step: BlockNumber(15),
+            }
+        }
+    }
+
+    impl Dummy for SignedEntityType {
+        /// Return a dummy [SignedEntityType] (test-only).
+        fn dummy() -> Self {
+            Self::MithrilStakeDistribution(Epoch(5))
+        }
+    }
+
+    impl Dummy for SupportedEra {
+        /// Return a dummy [SupportedEra] (test-only).
+        fn dummy() -> Self {
+            Self::eras().first().unwrap().to_owned()
+        }
+    }
+
+    impl Dummy for TimePoint {
+        /// Return a dummy [TimePoint] (test-only).
+        fn dummy() -> Self {
+            Self::new(10, 100, ChainPoint::dummy())
+        }
+    }
+}
+
+mod messages {
+    use chrono::Duration;
+    use std::collections::BTreeSet;
+
+    use crate::entities::{
+        AncillaryLocation, BlockNumber, CardanoDbBeacon, CardanoTransactionsSetProof,
+        CardanoTransactionsSigningConfig, CompressionAlgorithm, DigestLocation, Epoch,
+        ImmutablesLocation, MultiFilesUri, ProtocolMessage, ProtocolMessagePartKey,
+        ProtocolParameters, SignedEntityType, SignedEntityTypeDiscriminants, StakeDistribution,
+        StakeDistributionParty, TemplateUri,
+    };
+    use crate::messages::*;
+
+    use super::*;
+
+    impl Dummy for CardanoTransactionsSetProofMessagePart {
+        /// Return a dummy [CardanoTransactionsSetProofMessagePart] (test-only).
+        fn dummy() -> Self {
+            CardanoTransactionsSetProof::dummy().try_into().unwrap()
+        }
+    }
+
+    impl Dummy for CertificateMetadataMessagePart {
+        /// Return a dummy [CertificateMetadataMessagePart] (test-only).
+        fn dummy() -> Self {
+            let initiated_at = DateTime::parse_from_rfc3339("2024-02-12T13:11:47Z")
+                .unwrap()
+                .with_timezone(&Utc);
+
+            Self {
+                network: "testnet".to_string(),
+                protocol_version: "0.1.0".to_string(),
+                protocol_parameters: ProtocolParameters::new(1000, 100, 0.123),
+                initiated_at,
+                sealed_at: initiated_at + Duration::try_seconds(100).unwrap(),
+                signers: vec![
+                    StakeDistributionParty {
+                        party_id: "1".to_string(),
+                        stake: 10,
+                    },
+                    StakeDistributionParty {
+                        party_id: "2".to_string(),
+                        stake: 20,
+                    },
+                ],
+            }
+        }
+    }
+
+    impl Dummy for SignerWithStakeMessagePart {
+        /// Return a dummy [SignerWithStakeMessagePart] (test-only).
+        fn dummy() -> Self {
+            Self {
+                party_id: "pool1m8crhnqj5k2kyszf5j2scshupystyxc887zdfrpzh6ty6eun4fx".to_string(),
+                verification_key: fake_keys::signer_verification_key()[0].to_string(),
+                verification_key_signature: Some(
+                    fake_keys::signer_verification_key_signature()[0].to_string(),
+                ),
+                operational_certificate: Some(fake_keys::operational_certificate()[0].to_string()),
+                kes_period: Some(6),
+                stake: 234,
+            }
+        }
+    }
+
+    impl Dummy for SignerMessagePart {
+        /// Return a dummy [SignerMessagePart] (test-only).
+        fn dummy() -> Self {
+            Self {
+                party_id: "pool1m8crhnqj5k2kyszf5j2scshupystyxc887zdfrpzh6ty6eun4fx".to_string(),
+                verification_key: fake_keys::signer_verification_key()[0].to_string(),
+                verification_key_signature: Some(
+                    fake_keys::signer_verification_key_signature()[0].to_string(),
+                ),
+                operational_certificate: Some(fake_keys::operational_certificate()[0].to_string()),
+                kes_period: Some(6),
+            }
+        }
+    }
+
+    impl Dummy for AggregatorFeaturesMessage {
+        /// Return a dummy [AggregatorFeaturesMessage] (test-only).
+        fn dummy() -> Self {
+            AggregatorFeaturesMessage {
+                open_api_version: "0.0.1".to_string(),
+                documentation_url: "https://example.com".to_string(),
+                capabilities: AggregatorCapabilities {
+                    signed_entity_types: BTreeSet::from([
+                        SignedEntityTypeDiscriminants::MithrilStakeDistribution,
+                    ]),
+                    cardano_transactions_prover: None,
+                },
+            }
+        }
+    }
+
+    impl Dummy for CardanoDatabaseSnapshotMessage {
+        /// Return a dummy [CardanoDatabaseSnapshotMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                hash: "d4071d518a3ace0f6c04a9c0745b9e9560e3e2af1b373bafc4e0398423e9abfb"
+                    .to_string(),
+                merkle_root: "c8224920b9f5ad7377594eb8a15f34f08eb3103cc5241d57cafc5638403ec7c6"
+                    .to_string(),
+                network: "preview".to_string(),
+                beacon: CardanoDbBeacon {
+                    epoch: Epoch(123),
+                    immutable_file_number: 2345,
+                },
+                certificate_hash:
+                    "f6c01b373bafc4e039844071d5da3ace4a9c0745b9e9560e3e2af01823e9abfb".to_string(),
+                total_db_size_uncompressed: 800796318,
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+                digests: DigestsMessagePart {
+                    size_uncompressed: 1024,
+                    locations: vec![DigestLocation::Aggregator {
+                        uri: "https://host-1/digest-1".to_string(),
+                    }],
+                },
+                immutables: ImmutablesMessagePart {
+                    average_size_uncompressed: 512,
+                    locations: vec![
+                        ImmutablesLocation::CloudStorage {
+                            uri: MultiFilesUri::Template(TemplateUri(
+                                "https://host-1/immutables-2".to_string(),
+                            )),
+                            compression_algorithm: Some(CompressionAlgorithm::Gzip),
+                        },
+                        ImmutablesLocation::CloudStorage {
+                            uri: MultiFilesUri::Template(TemplateUri(
+                                "https://host-2/immutables-2".to_string(),
+                            )),
+                            compression_algorithm: Some(CompressionAlgorithm::Gzip),
+                        },
+                    ],
+                },
+                ancillary: AncillaryMessagePart {
+                    size_uncompressed: 2048,
+                    locations: vec![AncillaryLocation::CloudStorage {
+                        uri: "https://host-1/ancillary-3".to_string(),
+                        compression_algorithm: Some(CompressionAlgorithm::Gzip),
+                    }],
+                },
+                cardano_node_version: "0.0.1".to_string(),
+            }
+        }
+    }
+
+    impl Dummy for CardanoDatabaseDigestListItemMessage {
+        /// Return a dummy [CardanoDatabaseDigestListItemMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                immutable_file_name: "06685.chunk".to_string(),
+                digest: "0af556ab2620dd9363bf76963a231abe8948a500ea6be31b131d87907ab09b1e"
+                    .to_string(),
+            }
+        }
+    }
+
+    impl Dummy for CardanoDatabaseImmutableFilesRestoredMessage {
+        /// Return a dummy [CardanoDatabaseImmutableFilesRestoredMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                nb_immutable_files: 34,
+            }
+        }
+    }
+
+    impl Dummy for CardanoDatabaseSnapshotListItemMessage {
+        /// Return a dummy [CardanoDatabaseSnapshotListItemMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                hash: "d4071d518a3ace0f6c04a9c0745b9e9560e3e2af1b373bafc4e0398423e9abfb"
+                    .to_string(),
+                merkle_root: "c8224920b9f5ad7377594eb8a15f34f08eb3103cc5241d57cafc5638403ec7c6"
+                    .to_string(),
+                beacon: CardanoDbBeacon {
+                    epoch: Epoch(123),
+                    immutable_file_number: 2345,
+                },
+                certificate_hash:
+                    "f6c01b373bafc4e039844071d5da3ace4a9c0745b9e9560e3e2af01823e9abfb".to_string(),
+                total_db_size_uncompressed: 800796318,
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+                cardano_node_version: "0.0.1".to_string(),
+            }
+        }
+    }
+
+    impl Dummy for CardanoStakeDistributionMessage {
+        /// Return a dummy [CardanoStakeDistributionMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                epoch: Epoch(1),
+                hash: "hash-123".to_string(),
+                certificate_hash: "cert-hash-123".to_string(),
+                stake_distribution: StakeDistribution::from([("pool-123".to_string(), 1000)]),
+                created_at: DateTime::parse_from_rfc3339("2024-07-29T16:15:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+            }
+        }
+    }
+
+    impl Dummy for CardanoStakeDistributionListItemMessage {
+        /// Return a dummy [CardanoStakeDistributionListItemMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                epoch: Epoch(1),
+                hash: "hash-123".to_string(),
+                certificate_hash: "certificate-hash-123".to_string(),
+                created_at: DateTime::parse_from_rfc3339("2024-07-29T16:15:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+            }
+        }
+    }
+
+    impl Dummy for CardanoTransactionSnapshotMessage {
+        /// Return a dummy [CertificateMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                merkle_root: "mkroot-123".to_string(),
+                epoch: Epoch(10),
+                block_number: BlockNumber(100),
+                hash: "hash-123".to_string(),
+                certificate_hash: "cert-hash-123".to_string(),
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+            }
+        }
+    }
+
+    impl Dummy for CardanoTransactionSnapshotListItemMessage {
+        /// Return a dummy [CertificateMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                merkle_root: "mkroot-123".to_string(),
+                epoch: Epoch(10),
+                block_number: BlockNumber(100),
+                hash: "hash-123".to_string(),
+                certificate_hash: "cert-hash-123".to_string(),
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+            }
+        }
+    }
+
+    impl Dummy for CertificateMessage {
+        /// Return a dummy [CertificateMessage] (test-only).
+        fn dummy() -> Self {
+            let mut protocol_message = ProtocolMessage::new();
+            protocol_message.set_message_part(
+                ProtocolMessagePartKey::SnapshotDigest,
+                "snapshot-digest-123".to_string(),
+            );
+            protocol_message.set_message_part(
+                ProtocolMessagePartKey::NextAggregateVerificationKey,
+                fake_keys::aggregate_verification_key()[1].to_owned(),
+            );
+            let epoch = Epoch(10);
+
+            Self {
+                hash: "hash".to_string(),
+                previous_hash: "previous_hash".to_string(),
+                epoch,
+                signed_entity_type: SignedEntityType::MithrilStakeDistribution(epoch),
+                metadata: CertificateMetadataMessagePart::dummy(),
+                protocol_message: protocol_message.clone(),
+                signed_message: "signed_message".to_string(),
+                aggregate_verification_key: fake_keys::aggregate_verification_key()[0].to_owned(),
+                multi_signature: fake_keys::multi_signature()[0].to_owned(),
+                genesis_signature: String::new(),
+            }
+        }
+    }
+
+    impl Dummy for CertificateListItemMessage {
+        /// Return a dummy [CertificateListItemMessage] (test-only).
+        fn dummy() -> Self {
+            let mut protocol_message = ProtocolMessage::new();
+            protocol_message.set_message_part(
+                ProtocolMessagePartKey::SnapshotDigest,
+                "snapshot-digest-123".to_string(),
+            );
+            protocol_message.set_message_part(
+                ProtocolMessagePartKey::NextAggregateVerificationKey,
+                "next-avk-123".to_string(),
+            );
+            let epoch = Epoch(10);
+
+            Self {
+                hash: "hash".to_string(),
+                previous_hash: "previous_hash".to_string(),
+                epoch,
+                signed_entity_type: SignedEntityType::MithrilStakeDistribution(epoch),
+                metadata: CertificateListItemMessageMetadata {
+                    network: "testnet".to_string(),
+                    protocol_version: "0.1.0".to_string(),
+                    protocol_parameters: ProtocolParameters::new(1000, 100, 0.123),
+                    initiated_at: DateTime::parse_from_rfc3339("2024-02-12T13:11:47Z")
+                        .unwrap()
+                        .with_timezone(&Utc),
+                    sealed_at: DateTime::parse_from_rfc3339("2024-02-12T13:12:57Z")
+                        .unwrap()
+                        .with_timezone(&Utc),
+                    total_signers: 2,
+                },
+                protocol_message: protocol_message.clone(),
+                signed_message: "signed_message".to_string(),
+                aggregate_verification_key: "aggregate_verification_key".to_string(),
+            }
+        }
+    }
+
+    impl Dummy for EpochSettingsMessage {
+        /// Return a dummy [EpochSettingsMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                epoch: Epoch(10),
+                signer_registration_protocol_parameters: ProtocolParameters {
+                    k: 5,
+                    m: 100,
+                    phi_f: 0.65,
+                },
+                current_signers: [SignerMessagePart::dummy()].to_vec(),
+                next_signers: [SignerMessagePart::dummy()].to_vec(),
+                cardano_transactions_signing_config: Some(CardanoTransactionsSigningConfig::dummy()),
+                next_cardano_transactions_signing_config: Some(
+                    CardanoTransactionsSigningConfig::dummy(),
+                ),
+            }
+        }
+    }
+
+    impl Dummy for MithrilStakeDistributionMessage {
+        /// Return a dummy [MithrilStakeDistributionMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                epoch: Epoch(1),
+                signers_with_stake: vec![SignerWithStakeMessagePart::dummy()],
+                hash: "hash-123".to_string(),
+                certificate_hash: "cert-hash-123".to_string(),
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+                protocol_parameters: fake_data::protocol_parameters(),
+            }
+        }
+    }
+
+    impl Dummy for MithrilStakeDistributionListItemMessage {
+        /// Return a dummy [MithrilStakeDistributionListItemMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                epoch: Epoch(1),
+                hash: "hash-123".to_string(),
+                certificate_hash: "certificate-hash-123".to_string(),
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+            }
+        }
+    }
+
+    impl Dummy for RegisterSignatureMessageHttp {
+        /// Return a dummy [RegisterSignatureMessageHttp] (test-only).
+        fn dummy() -> Self {
+            use crate::entities::Epoch;
+            Self {
+                signed_entity_type: SignedEntityType::MithrilStakeDistribution(Epoch(5)),
+                party_id: "party_id".to_string(),
+                signature: fake_keys::single_signature()[0].to_string(),
+                won_indexes: vec![1, 3],
+                signed_message: "6a7e737c312972d2346b65ac3075696e04286d046dddaf8004121e3d5e27cc0d"
+                    .to_string(),
+            }
+        }
+    }
+
+    impl Dummy for RegisterSignatureMessageDmq {
+        /// Return a dummy [RegisterSignatureMessageDmq] (test-only).
+        fn dummy() -> Self {
+            use crate::entities::Epoch;
+            Self {
+                signed_entity_type: SignedEntityType::MithrilStakeDistribution(Epoch(5)),
+                signature: fake_keys::single_signature()[0].try_into().unwrap(),
+            }
+        }
+    }
+
+    impl Dummy for RegisterSignerMessage {
+        /// Return a dummy [RegisterSignerMessage] (test-only).
+        fn dummy() -> Self {
+            use crate::test_utils::fake_keys;
+
+            Self {
+                epoch: Epoch(1),
+                party_id: "pool1m8crhnqj5k2kyszf5j2scshupystyxc887zdfrpzh6ty6eun4fx".to_string(),
+                verification_key: fake_keys::signer_verification_key()[0].to_string(),
+                verification_key_signature: Some(
+                    fake_keys::signer_verification_key_signature()[0].to_string(),
+                ),
+                operational_certificate: Some(fake_keys::operational_certificate()[0].to_string()),
+                kes_period: Some(6),
+            }
+        }
+    }
+
+    impl Dummy for SnapshotMessage {
+        /// Return a dummy [SnapshotMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                digest: "0b9f5ad7f33cc523775c82249294eb8a1541d54f08eb3107cafc5638403ec7c6"
+                    .to_string(),
+                network: "preview".to_string(),
+                beacon: CardanoDbBeacon {
+                    epoch: Epoch(86),
+                    immutable_file_number: 1728,
+                },
+                certificate_hash:
+                    "d5daf6c03ace4a9c074e951844075b9b373bafc4e039160e3e2af01823e9abfb".to_string(),
+                size: 807803196,
+                ancillary_size: Some(123456789),
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+                locations: vec!["https://host/certificate.tar.gz".to_string()],
+                ancillary_locations: Some(vec!["https://host/ancillary.tar.gz".to_string()]),
+                compression_algorithm: CompressionAlgorithm::Gzip,
+                cardano_node_version: "0.0.1".to_string(),
+            }
+        }
+    }
+
+    impl Dummy for SnapshotDownloadMessage {
+        /// Return a dummy [SnapshotDownloadMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                digest: "0b9f5ad7f33cc523775c82249294eb8a1541d54f08eb3107cafc5638403ec7c6"
+                    .to_string(),
+                network: "preview".to_string(),
+                beacon: CardanoDbBeacon {
+                    epoch: Epoch(86),
+                    immutable_file_number: 1728,
+                },
+                size: 807803196,
+                ancillary_size: Some(123456789),
+                locations: vec!["https://host/certificate.tar.gz".to_string()],
+                ancillary_locations: Some(vec!["https://host/ancillary.tar.gz".to_string()]),
+                compression_algorithm: CompressionAlgorithm::Gzip,
+                cardano_node_version: "0.0.1".to_string(),
+            }
+        }
+    }
+
+    impl Dummy for SnapshotListItemMessage {
+        /// Return a dummy [SnapshotListItemMessage] (test-only).
+        fn dummy() -> Self {
+            Self {
+                digest: "0b9f5ad7f33cc523775c82249294eb8a1541d54f08eb3107cafc5638403ec7c6"
+                    .to_string(),
+                network: "preview".to_string(),
+                beacon: CardanoDbBeacon {
+                    epoch: Epoch(86),
+                    immutable_file_number: 1728,
+                },
+                certificate_hash:
+                    "d5daf6c03ace4a9c074e951844075b9b373bafc4e039160e3e2af01823e9abfb".to_string(),
+                size: 807803196,
+                ancillary_size: Some(123456789),
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+                locations: vec!["https://host/certificate.tar.gz".to_string()],
+                ancillary_locations: Some(vec!["https://host/ancillary.tar.gz".to_string()]),
+                compression_algorithm: CompressionAlgorithm::default(),
+                cardano_node_version: "0.0.1".to_string(),
+            }
+        }
+    }
+}
+
+mod signable_builder {
+    use crate::entities::{
+        CardanoDbBeacon, CardanoStakeDistribution, CardanoTransactionsSnapshot, Epoch,
+        MithrilStakeDistribution, SignedEntityType, Snapshot,
+    };
+    use crate::signable_builder::SignedEntity;
+
+    use super::*;
+
+    impl Dummy for SignedEntity<Snapshot> {
+        /// Create a dummy [SignedEntity] for [Snapshot] entity
+        fn dummy() -> Self {
+            SignedEntity {
+                signed_entity_id: "snapshot-id-123".to_string(),
+                signed_entity_type: SignedEntityType::CardanoImmutableFilesFull(
+                    CardanoDbBeacon::default(),
+                ),
+                certificate_id: "certificate-hash-123".to_string(),
+                artifact: fake_data::snapshots(1)[0].to_owned(),
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+            }
+        }
+    }
+
+    impl Dummy for SignedEntity<MithrilStakeDistribution> {
+        /// Create a dummy [SignedEntity] for [MithrilStakeDistribution] entity
+        fn dummy() -> Self {
+            SignedEntity {
+                signed_entity_id: "mithril-stake-distribution-id-123".to_string(),
+                signed_entity_type: SignedEntityType::MithrilStakeDistribution(Epoch(1)),
+                certificate_id: "certificate-hash-123".to_string(),
+                artifact: fake_data::mithril_stake_distributions(1)[0].to_owned(),
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+            }
+        }
+    }
+
+    impl Dummy for SignedEntity<CardanoTransactionsSnapshot> {
+        /// Create a dummy [SignedEntity] for [CardanoTransactionsSnapshot] entity
+        fn dummy() -> Self {
+            let block_number = crate::entities::BlockNumber(50);
+            SignedEntity {
+                signed_entity_id: "snapshot-id-123".to_string(),
+                signed_entity_type: SignedEntityType::CardanoTransactions(Epoch(5), block_number),
+                certificate_id: "certificate-hash-123".to_string(),
+                artifact: CardanoTransactionsSnapshot::new("mkroot123".to_string(), block_number),
+                created_at: DateTime::parse_from_rfc3339("2023-01-19T13:43:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+            }
+        }
+    }
+
+    impl Dummy for SignedEntity<CardanoStakeDistribution> {
+        /// Create a dummy [SignedEntity] for [CardanoStakeDistribution] entity
+        fn dummy() -> Self {
+            SignedEntity {
+                signed_entity_id: "cardano-stake-distribution-id-123".to_string(),
+                signed_entity_type: SignedEntityType::CardanoStakeDistribution(Epoch(1)),
+                certificate_id: "certificate-hash-123".to_string(),
+                artifact: fake_data::cardano_stake_distributions(1)[0].to_owned(),
+                created_at: DateTime::parse_from_rfc3339("2024-07-29T16:15:05.618857482Z")
+                    .unwrap()
+                    .with_timezone(&Utc),
+            }
+        }
+    }
+}
diff --git a/mithril-common/src/test_utils/double/mod.rs b/mithril-common/src/test_utils/double/mod.rs
new file mode 100644
index 00000000000..4563ec8d91b
--- /dev/null
+++ b/mithril-common/src/test_utils/double/mod.rs
@@ -0,0 +1,35 @@
+//! Test doubles
+//!
+//! Enable unit testing with controlled inputs and predictable behavior.
+
+mod dummies;
+
+/// A trait for giving a type a dummy value.
+///
+/// Sometimes in tests you need to provide a value for a type, but the actual value doesn't matter.
+/// This trait allows defining a "dummy" value for a type, separated from an eventual default
+/// value, that can be reused across multiple tests.
+///
+/// Note: should not be confused with "fake" values, fake values aim to be believable and contain
+/// valid cryptography (if they have some), dummies don't aim for those characteristics.
+///
+/// # Example
+/// ```
+/// use mithril_common::test_utils::double::Dummy;
+///
+/// struct MyType(String);
+///
+/// impl Dummy for MyType {
+///     fn dummy() -> Self {
+///         MyType("whatever".to_string())
+///     }
+/// }
+///
+/// let instance = MyType::dummy();
+/// ```
+pub trait Dummy: Sized {
+    /// Return a dummy value for the type
+    ///
+    /// Useful for test contexts when the actual value doesn't matter.
+    fn dummy() -> Self;
+}
diff --git a/mithril-common/src/test_utils/fake_data.rs b/mithril-common/src/test_utils/fake_data.rs
index 2f0568ebcb6..a19084a5950 100644
--- a/mithril-common/src/test_utils/fake_data.rs
+++ b/mithril-common/src/test_utils/fake_data.rs
@@ -11,13 +11,13 @@ use crate::entities::{
     ImmutablesLocations, LotteryIndex, ProtocolMessage, ProtocolMessagePartKey, SignedEntityType,
     SingleSignature, SlotNumber, StakeDistribution, StakeDistributionParty,
 };
-use crate::test_utils::MithrilFixtureBuilder;
+use crate::test_utils::{MithrilFixtureBuilder, double::Dummy};
 
 use super::fake_keys;
 
 /// Fake network
-pub fn network() -> crate::CardanoNetwork {
-    crate::CardanoNetwork::TestNet(CardanoNetwork::DEVNET_MAGIC_ID)
+pub fn network() -> CardanoNetwork {
+    CardanoNetwork::TestNet(CardanoNetwork::DEVNET_MAGIC_ID)
 }
 
 /// Fake Beacon
diff --git a/mithril-common/src/test_utils/mod.rs b/mithril-common/src/test_utils/mod.rs
index 535e27de0f0..ff6e9311610 100644
--- a/mithril-common/src/test_utils/mod.rs
+++ b/mithril-common/src/test_utils/mod.rs
@@ -6,6 +6,7 @@
 //! * A builder of [MithrilFixture] to generate signers alongside a stake distribution
 //!
 
+pub mod double;
 pub mod fake_data;
 pub mod fake_keys;
 pub mod mock_extensions;
diff --git a/mithril-relay/Cargo.toml b/mithril-relay/Cargo.toml
index 645cf7b087a..2cc3ed0e29d 100644
--- a/mithril-relay/Cargo.toml
+++ b/mithril-relay/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-relay"
-version = "0.1.47"
+version = "0.1.48"
 description = "A Mithril relay"
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-relay/src/relay/aggregator.rs b/mithril-relay/src/relay/aggregator.rs
index 9ec0e155896..0d25c4c829f 100644
--- a/mithril-relay/src/relay/aggregator.rs
+++ b/mithril-relay/src/relay/aggregator.rs
@@ -154,6 +154,7 @@ impl AggregatorRelay {
 #[cfg(test)]
 mod tests {
     use httpmock::MockServer;
+    use mithril_common::test_utils::double::Dummy;
 
     use crate::test_tools::TestLogger;
 
diff --git a/mithril-relay/src/relay/signer.rs b/mithril-relay/src/relay/signer.rs
index 2587666f13d..8b429ee6cf3 100644
--- a/mithril-relay/src/relay/signer.rs
+++ b/mithril-relay/src/relay/signer.rs
@@ -398,6 +398,7 @@ mod tests {
         Method::{GET, POST},
         MockServer,
     };
+    use mithril_common::test_utils::double::Dummy;
     use tokio::sync::mpsc::error::TryRecvError;
 
     use crate::{repeater, test_tools::TestLogger};
diff --git a/mithril-relay/tests/register_signer_signature.rs b/mithril-relay/tests/register_signer_signature.rs
index 39a3c12818f..7c58670c008 100644
--- a/mithril-relay/tests/register_signer_signature.rs
+++ b/mithril-relay/tests/register_signer_signature.rs
@@ -2,6 +2,7 @@ use std::{sync::Arc, time::Duration};
 
 use libp2p::{Multiaddr, gossipsub};
 use mithril_common::messages::{RegisterSignatureMessageHttp, RegisterSignerMessage};
+use mithril_common::test_utils::double::Dummy;
 use mithril_relay::{
     PassiveRelay, SignerRelay, SignerRelayMode,
     p2p::{BroadcastMessage, PeerBehaviourEvent, PeerEvent},
diff --git a/mithril-signer/Cargo.toml b/mithril-signer/Cargo.toml
index 1c1230bc888..976b825d980 100644
--- a/mithril-signer/Cargo.toml
+++ b/mithril-signer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-signer"
-version = "0.2.260"
+version = "0.2.261"
 description = "A Mithril Signer"
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-signer/src/database/repository/signed_beacon_repository.rs b/mithril-signer/src/database/repository/signed_beacon_repository.rs
index 5da4e1587bf..8848ef86795 100644
--- a/mithril-signer/src/database/repository/signed_beacon_repository.rs
+++ b/mithril-signer/src/database/repository/signed_beacon_repository.rs
@@ -90,6 +90,7 @@ mod tests {
     use mithril_common::entities::{
         BlockNumber, Epoch, SignedEntityConfig, SignedEntityTypeDiscriminants, TimePoint,
     };
+    use mithril_common::test_utils::double::Dummy;
     use mithril_persistence::sqlite::ConnectionExtensions;
 
     use crate::database::query::GetSignedBeaconQuery;
diff --git a/mithril-signer/src/dependency_injection/builder.rs b/mithril-signer/src/dependency_injection/builder.rs
index 84901ff2236..78ccc696f7b 100644
--- a/mithril-signer/src/dependency_injection/builder.rs
+++ b/mithril-signer/src/dependency_injection/builder.rs
@@ -507,6 +507,7 @@ mod tests {
 
     use mithril_cardano_node_chain::test::double::FakeChainObserver;
     use mithril_cardano_node_internal_database::test::double::DumbImmutableFileObserver;
+    use mithril_common::test_utils::double::Dummy;
     use mithril_common::{entities::TimePoint, test_utils::TempDir};
 
     use crate::test_tools::TestLogger;
diff --git a/mithril-signer/src/entities/signer_epoch_settings.rs b/mithril-signer/src/entities/signer_epoch_settings.rs
index 618c6ce0df8..1a1df619ce7 100644
--- a/mithril-signer/src/entities/signer_epoch_settings.rs
+++ b/mithril-signer/src/entities/signer_epoch_settings.rs
@@ -24,10 +24,10 @@ pub struct SignerEpochSettings {
     pub next_cardano_transactions_signing_config: Option<CardanoTransactionsSigningConfig>,
 }
 
-impl SignerEpochSettings {
-    #[cfg(test)]
-    /// Create a dummy SignerEpochSettings
-    pub fn dummy() -> SignerEpochSettings {
+#[cfg(test)]
+impl mithril_common::test_utils::double::Dummy for SignerEpochSettings {
+    /// Create a dummy `SignerEpochSettings`
+    fn dummy() -> SignerEpochSettings {
         use mithril_common::test_utils::fake_data;
 
         // Beacon
diff --git a/mithril-signer/src/message_adapters/from_epoch_settings.rs b/mithril-signer/src/message_adapters/from_epoch_settings.rs
index 55a11b1db0a..d9cb5a61a5f 100644
--- a/mithril-signer/src/message_adapters/from_epoch_settings.rs
+++ b/mithril-signer/src/message_adapters/from_epoch_settings.rs
@@ -29,6 +29,8 @@ impl TryFromMessageAdapter<EpochSettingsMessage, SignerEpochSettings> for FromEp
 
 #[cfg(test)]
 mod tests {
+    use mithril_common::test_utils::double::Dummy;
+
     use super::*;
 
     #[test]
diff --git a/mithril-signer/src/runtime/runner.rs b/mithril-signer/src/runtime/runner.rs
index 9a6755b5ff3..95021d5acf5 100644
--- a/mithril-signer/src/runtime/runner.rs
+++ b/mithril-signer/src/runtime/runner.rs
@@ -353,7 +353,7 @@ mod tests {
             CardanoTransactionsSignableBuilder, MithrilSignableBuilderService,
             MithrilStakeDistributionSignableBuilder, SignableBuilderServiceDependencies,
         },
-        test_utils::{MithrilFixtureBuilder, fake_data},
+        test_utils::{MithrilFixtureBuilder, double::Dummy, fake_data},
     };
     use mithril_era::{EraChecker, EraReader, adapters::EraReaderBootstrapAdapter};
     use mithril_signed_entity_lock::SignedEntityTypeLock;
diff --git a/mithril-signer/src/runtime/state_machine.rs b/mithril-signer/src/runtime/state_machine.rs
index d277cc9663f..78e86f91b04 100644
--- a/mithril-signer/src/runtime/state_machine.rs
+++ b/mithril-signer/src/runtime/state_machine.rs
@@ -477,7 +477,7 @@ mod tests {
     use mockall::predicate;
 
     use mithril_common::entities::{ChainPoint, Epoch, ProtocolMessage, SignedEntityType};
-    use mithril_common::test_utils::fake_data;
+    use mithril_common::test_utils::{double::Dummy, fake_data};
 
     use crate::runtime::runner::MockSignerRunner;
     use crate::services::AggregatorClientError;
diff --git a/mithril-signer/src/services/aggregator_client.rs b/mithril-signer/src/services/aggregator_client.rs
index 6c208255d41..d1d2fbeb1ce 100644
--- a/mithril-signer/src/services/aggregator_client.rs
+++ b/mithril-signer/src/services/aggregator_client.rs
@@ -380,6 +380,7 @@ impl AggregatorClient for AggregatorHTTPClient {
 
 #[cfg(test)]
 pub(crate) mod dumb {
+    use mithril_common::test_utils::double::Dummy;
     use tokio::sync::RwLock;
 
     use super::*;
@@ -472,7 +473,7 @@ mod tests {
     use mithril_common::api_version::DummyApiVersionDiscriminantSource;
     use mithril_common::entities::Epoch;
     use mithril_common::messages::TryFromMessageAdapter;
-    use mithril_common::test_utils::{MemoryDrainForTestInspector, fake_data};
+    use mithril_common::test_utils::{MemoryDrainForTestInspector, double::Dummy, fake_data};
 
     use crate::test_tools::TestLogger;
 
diff --git a/mithril-signer/src/services/cardano_transactions/preloader_checker.rs b/mithril-signer/src/services/cardano_transactions/preloader_checker.rs
index 23739892e8c..cf118cf3fe9 100644
--- a/mithril-signer/src/services/cardano_transactions/preloader_checker.rs
+++ b/mithril-signer/src/services/cardano_transactions/preloader_checker.rs
@@ -43,6 +43,7 @@ mod tests {
 
     use mithril_common::{
         entities::SignedEntityTypeDiscriminants, messages::AggregatorFeaturesMessage,
+        test_utils::double::Dummy,
     };
 
     use crate::services::{AggregatorClientError, MockAggregatorClient};
diff --git a/mithril-signer/src/services/certifier.rs b/mithril-signer/src/services/certifier.rs
index e3c7717dd4f..87a8babbe1c 100644
--- a/mithril-signer/src/services/certifier.rs
+++ b/mithril-signer/src/services/certifier.rs
@@ -156,7 +156,7 @@ mod tests {
         CardanoTransactionsSigningConfig, ChainPoint, Epoch, ProtocolMessagePartKey,
         SignedEntityTypeDiscriminants,
     };
-    use mithril_common::test_utils::fake_data;
+    use mithril_common::test_utils::{double::Dummy, fake_data};
 
     use crate::services::{MockSignaturePublisher, MockSingleSigner};
 
diff --git a/mithril-signer/src/services/epoch_service.rs b/mithril-signer/src/services/epoch_service.rs
index 720e8782557..59452f65e16 100644
--- a/mithril-signer/src/services/epoch_service.rs
+++ b/mithril-signer/src/services/epoch_service.rs
@@ -428,7 +428,7 @@ mod tests {
     use tokio::sync::RwLock;
 
     use mithril_common::entities::{Epoch, StakeDistribution};
-    use mithril_common::test_utils::{MithrilFixtureBuilder, fake_data};
+    use mithril_common::test_utils::{MithrilFixtureBuilder, double::Dummy, fake_data};
 
     use crate::database::repository::{ProtocolInitializerRepository, StakePoolStore};
     use crate::database::test_helper::main_db_connection;
diff --git a/mithril-signer/src/services/signature_publisher/dmq.rs b/mithril-signer/src/services/signature_publisher/dmq.rs
index bb1049fb13f..7d251efb78f 100644
--- a/mithril-signer/src/services/signature_publisher/dmq.rs
+++ b/mithril-signer/src/services/signature_publisher/dmq.rs
@@ -46,7 +46,7 @@ impl SignaturePublisher for SignaturePublisherDmq {
 
 #[cfg(test)]
 mod tests {
-    use mithril_common::test_utils::fake_data;
+    use mithril_common::test_utils::{double::Dummy, fake_data};
     use mithril_dmq::test::double::DmqPublisherFake;
 
     use super::*;
diff --git a/mithril-signer/tests/era_switch.rs b/mithril-signer/tests/era_switch.rs
index a36b36ab3e3..70578005649 100644
--- a/mithril-signer/tests/era_switch.rs
+++ b/mithril-signer/tests/era_switch.rs
@@ -3,7 +3,7 @@ mod test_extensions;
 use mithril_common::{
     crypto_helper::tests_setup,
     entities::{BlockNumber, ChainPoint, Epoch, SlotNumber, SupportedEra, TimePoint},
-    test_utils::MithrilFixtureBuilder,
+    test_utils::{MithrilFixtureBuilder, double::Dummy},
 };
 use mithril_era::EraMarker;
 use test_extensions::StateMachineTester;
diff --git a/mithril-signer/tests/test_extensions/certificate_handler.rs b/mithril-signer/tests/test_extensions/certificate_handler.rs
index 6ad338b3f31..fb5a54903d5 100644
--- a/mithril-signer/tests/test_extensions/certificate_handler.rs
+++ b/mithril-signer/tests/test_extensions/certificate_handler.rs
@@ -10,7 +10,7 @@ use mithril_common::{
         SignedEntityType, SignedEntityTypeDiscriminants, Signer, SingleSignature, TimePoint,
     },
     messages::AggregatorFeaturesMessage,
-    test_utils::fake_data,
+    test_utils::{double::Dummy, fake_data},
 };
 use mithril_ticker::{MithrilTickerService, TickerService};
 
diff --git a/mithril-signer/tests/test_extensions/state_machine_tester.rs b/mithril-signer/tests/test_extensions/state_machine_tester.rs
index e5871065f6a..a755eb716bd 100644
--- a/mithril-signer/tests/test_extensions/state_machine_tester.rs
+++ b/mithril-signer/tests/test_extensions/state_machine_tester.rs
@@ -39,6 +39,7 @@ use mithril_common::{
         MithrilSignableBuilderService, MithrilStakeDistributionSignableBuilder,
         SignableBuilderServiceDependencies,
     },
+    test_utils::double::Dummy,
 };
 use mithril_era::{EraChecker, EraMarker, EraReader, adapters::EraReaderDummyAdapter};
 use mithril_persistence::{