diff --git a/src/Microsoft.ML.AutoML/API/ColumnInference.cs b/src/Microsoft.ML.AutoML/API/ColumnInference.cs
index ab2539b948..a2d697da98 100644
--- a/src/Microsoft.ML.AutoML/API/ColumnInference.cs
+++ b/src/Microsoft.ML.AutoML/API/ColumnInference.cs
@@ -5,6 +5,7 @@
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using Microsoft.ML.Data;
+using Newtonsoft.Json;
 
 namespace Microsoft.ML.AutoML
 {
@@ -20,6 +21,7 @@ public sealed class ColumnInferenceResults
         /// Can be used to instantiate a new <see cref="TextLoader" /> to load
         /// data into an <see cref="IDataView" />.
         /// </remarks>
+        [JsonProperty(DefaultValueHandling = DefaultValueHandling.Include)]
         public TextLoader.Options TextLoaderOptions { get; internal set; }
 
         /// <summary>
@@ -31,6 +33,7 @@ public sealed class ColumnInferenceResults
         /// See <typeref cref="ExperimentBase{TMetrics, TExperimentSettings}.Execute(IDataView, ColumnInformation, IEstimator{ITransformer}, System.IProgress{RunDetail{TMetrics}})" />
         /// for example.</para>
         /// </remarks>
+        [JsonProperty(DefaultValueHandling = DefaultValueHandling.Include)]
         public ColumnInformation ColumnInformation { get; internal set; }
     }
 
@@ -90,31 +93,36 @@ public sealed class ColumnInformation
         /// <remarks>
         /// Categorical data columns should generally be columns that contain a small number of unique values.
         /// </remarks>
-        public ICollection<string> CategoricalColumnNames { get; }
+        [JsonProperty]
+        public ICollection<string> CategoricalColumnNames { get; private set; }
 
         /// <summary>
         /// The dataset columns that are numeric.
         /// </summary>
         /// <value>The default value is a new, empty <see cref="Collection{String}"/>.</value>
-        public ICollection<string> NumericColumnNames { get; }
+        [JsonProperty]
+        public ICollection<string> NumericColumnNames { get; private set; }
 
         /// <summary>
         /// The dataset columns that are text.
         /// </summary>
         /// <value>The default value is a new, empty <see cref="Collection{String}"/>.</value>
-        public ICollection<string> TextColumnNames { get; }
+        [JsonProperty]
+        public ICollection<string> TextColumnNames { get; private set; }
 
         /// <summary>
         /// The dataset columns that AutoML should ignore.
         /// </summary>
         /// <value>The default value is a new, empty <see cref="Collection{String}"/>.</value>
-        public ICollection<string> IgnoredColumnNames { get; }
+        [JsonProperty]
+        public ICollection<string> IgnoredColumnNames { get; private set; }
 
         /// <summary>
         /// The dataset columns that are image paths.
         /// </summary>
         /// <value>The default value is a new, empty <see cref="Collection{String}"/>.</value>
-        public ICollection<string> ImagePathColumnNames { get; }
+        [JsonProperty]
+        public ICollection<string> ImagePathColumnNames { get; private set; }
 
         public ColumnInformation()
         {
diff --git a/src/Microsoft.ML.AutoML/Assembly.cs b/src/Microsoft.ML.AutoML/Assembly.cs
index 1fd879e42e..110e01af7b 100644
--- a/src/Microsoft.ML.AutoML/Assembly.cs
+++ b/src/Microsoft.ML.AutoML/Assembly.cs
@@ -13,5 +13,5 @@
 [assembly: InternalsVisibleTo("Microsoft.ML.ModelBuilder, PublicKey=002400000480000094000000060200000024000052534131000400000100010007d1fa57c4aed9f0a32e84aa0faefd0de9e8fd6aec8f87fb03766c834c99921eb23be79ad9d5dcc1dd9ad236132102900b723cf980957fc4e177108fc607774f29e8320e92ea05ece4e821c0a5efe8f1645c4c0c93c1ab99285d622caa652c1dfad63d745d6f2de5f17e5eaf0fc4963d261c8a12436518206dc093344d5ad293")]
 [assembly: InternalsVisibleTo("Microsoft.ML.ModelBuilder.AutoMLService, PublicKey=002400000480000094000000060200000024000052534131000400000100010007d1fa57c4aed9f0a32e84aa0faefd0de9e8fd6aec8f87fb03766c834c99921eb23be79ad9d5dcc1dd9ad236132102900b723cf980957fc4e177108fc607774f29e8320e92ea05ece4e821c0a5efe8f1645c4c0c93c1ab99285d622caa652c1dfad63d745d6f2de5f17e5eaf0fc4963d261c8a12436518206dc093344d5ad293")]
 [assembly: InternalsVisibleTo("Microsoft.ML.ModelBuilder.AutoMLService.Gpu, PublicKey=002400000480000094000000060200000024000052534131000400000100010007d1fa57c4aed9f0a32e84aa0faefd0de9e8fd6aec8f87fb03766c834c99921eb23be79ad9d5dcc1dd9ad236132102900b723cf980957fc4e177108fc607774f29e8320e92ea05ece4e821c0a5efe8f1645c4c0c93c1ab99285d622caa652c1dfad63d745d6f2de5f17e5eaf0fc4963d261c8a12436518206dc093344d5ad293")]
-[assembly: InternalsVisibleTo("Microsoft.ML.ModelBuilder.AutoMLService.Test, PublicKey=002400000480000094000000060200000024000052534131000400000100010007d1fa57c4aed9f0a32e84aa0faefd0de9e8fd6aec8f87fb03766c834c99921eb23be79ad9d5dcc1dd9ad236132102900b723cf980957fc4e177108fc607774f29e8320e92ea05ece4e821c0a5efe8f1645c4c0c93c1ab99285d622caa652c1dfad63d745d6f2de5f17e5eaf0fc4963d261c8a12436518206dc093344d5ad293")]
+[assembly: InternalsVisibleTo("Microsoft.ML.ModelBuilder.AutoMLService.Tests, PublicKey=002400000480000094000000060200000024000052534131000400000100010007d1fa57c4aed9f0a32e84aa0faefd0de9e8fd6aec8f87fb03766c834c99921eb23be79ad9d5dcc1dd9ad236132102900b723cf980957fc4e177108fc607774f29e8320e92ea05ece4e821c0a5efe8f1645c4c0c93c1ab99285d622caa652c1dfad63d745d6f2de5f17e5eaf0fc4963d261c8a12436518206dc093344d5ad293")]
 
diff --git a/src/Microsoft.ML.CodeGenerator/Assembly.cs b/src/Microsoft.ML.CodeGenerator/Assembly.cs
index 9b9e70ea85..71b6b77d88 100644
--- a/src/Microsoft.ML.CodeGenerator/Assembly.cs
+++ b/src/Microsoft.ML.CodeGenerator/Assembly.cs
@@ -10,4 +10,4 @@
 [assembly: InternalsVisibleTo("mlnet.Tests, PublicKey=00240000048000009400000006020000002400005253413100040000010001004b86c4cb78549b34bab61a3b1800e23bfeb5b3ec390074041536a7e3cbd97f5f04cf0f857155a8928eaa29ebfd11cfbbad3ba70efea7bda3226c6a8d370a4cd303f714486b6ebc225985a638471e6ef571cc92a4613c00b8fa65d61ccee0cbe5f36330c9a01f4183559f1bef24cc2917c6d913e3a541333a1d05d9bed22b38cb")]
 [assembly: InternalsVisibleTo("Microsoft.ML.ModelBuilder.AutoMLService, PublicKey=002400000480000094000000060200000024000052534131000400000100010007d1fa57c4aed9f0a32e84aa0faefd0de9e8fd6aec8f87fb03766c834c99921eb23be79ad9d5dcc1dd9ad236132102900b723cf980957fc4e177108fc607774f29e8320e92ea05ece4e821c0a5efe8f1645c4c0c93c1ab99285d622caa652c1dfad63d745d6f2de5f17e5eaf0fc4963d261c8a12436518206dc093344d5ad293")]
 [assembly: InternalsVisibleTo("Microsoft.ML.ModelBuilder.AutoMLService.Gpu, PublicKey=002400000480000094000000060200000024000052534131000400000100010007d1fa57c4aed9f0a32e84aa0faefd0de9e8fd6aec8f87fb03766c834c99921eb23be79ad9d5dcc1dd9ad236132102900b723cf980957fc4e177108fc607774f29e8320e92ea05ece4e821c0a5efe8f1645c4c0c93c1ab99285d622caa652c1dfad63d745d6f2de5f17e5eaf0fc4963d261c8a12436518206dc093344d5ad293")]
-[assembly: InternalsVisibleTo("Microsoft.ML.ModelBuilder.AutoMLService.Test, PublicKey=002400000480000094000000060200000024000052534131000400000100010007d1fa57c4aed9f0a32e84aa0faefd0de9e8fd6aec8f87fb03766c834c99921eb23be79ad9d5dcc1dd9ad236132102900b723cf980957fc4e177108fc607774f29e8320e92ea05ece4e821c0a5efe8f1645c4c0c93c1ab99285d622caa652c1dfad63d745d6f2de5f17e5eaf0fc4963d261c8a12436518206dc093344d5ad293")]
+[assembly: InternalsVisibleTo("Microsoft.ML.ModelBuilder.AutoMLService.Tests, PublicKey=002400000480000094000000060200000024000052534131000400000100010007d1fa57c4aed9f0a32e84aa0faefd0de9e8fd6aec8f87fb03766c834c99921eb23be79ad9d5dcc1dd9ad236132102900b723cf980957fc4e177108fc607774f29e8320e92ea05ece4e821c0a5efe8f1645c4c0c93c1ab99285d622caa652c1dfad63d745d6f2de5f17e5eaf0fc4963d261c8a12436518206dc093344d5ad293")]
diff --git a/test/Microsoft.ML.AutoML.Tests/ApprovalTests/ColumnInferenceTests.Wiki_column_inference_result_should_be_serializable.approved.txt b/test/Microsoft.ML.AutoML.Tests/ApprovalTests/ColumnInferenceTests.Wiki_column_inference_result_should_be_serializable.approved.txt
new file mode 100644
index 0000000000..79c9e98a07
--- /dev/null
+++ b/test/Microsoft.ML.AutoML.Tests/ApprovalTests/ColumnInferenceTests.Wiki_column_inference_result_should_be_serializable.approved.txt
@@ -0,0 +1,66 @@
+{
+  "TextLoaderOptions": {
+    "AllowQuoting": true,
+    "AllowSparse": false,
+    "InputSize": null,
+    "Separators": [
+      "\t"
+    ],
+    "DecimalMarker": ".",
+    "Columns": [
+      {
+        "Name": "Sentiment",
+        "Source": [
+          {
+            "Min": 0,
+            "Max": 0,
+            "AutoEnd": false,
+            "VariableEnd": false,
+            "AllOther": false,
+            "ForceVector": false
+          }
+        ],
+        "KeyCount": null,
+        "DataKind": 11
+      },
+      {
+        "Name": "SentimentText",
+        "Source": [
+          {
+            "Min": 1,
+            "Max": 1,
+            "AutoEnd": false,
+            "VariableEnd": false,
+            "AllOther": false,
+            "ForceVector": false
+          }
+        ],
+        "KeyCount": null,
+        "DataKind": 11
+      }
+    ],
+    "TrimWhitespace": false,
+    "HasHeader": true,
+    "UseThreads": true,
+    "ReadMultilines": false,
+    "HeaderFile": null,
+    "MaxRows": null,
+    "EscapeChar": "\"",
+    "MissingRealsAsNaNs": false
+  },
+  "ColumnInformation": {
+    "LabelColumnName": "Sentiment",
+    "UserIdColumnName": null,
+    "GroupIdColumnName": null,
+    "ItemIdColumnName": null,
+    "ExampleWeightColumnName": null,
+    "SamplingKeyColumnName": null,
+    "CategoricalColumnNames": [],
+    "NumericColumnNames": [],
+    "TextColumnNames": [
+      "SentimentText"
+    ],
+    "IgnoredColumnNames": [],
+    "ImagePathColumnNames": []
+  }
+}
\ No newline at end of file
diff --git a/test/Microsoft.ML.AutoML.Tests/ColumnInferenceTests.cs b/test/Microsoft.ML.AutoML.Tests/ColumnInferenceTests.cs
index f7b7c2f2fb..63ada4d493 100644
--- a/test/Microsoft.ML.AutoML.Tests/ColumnInferenceTests.cs
+++ b/test/Microsoft.ML.AutoML.Tests/ColumnInferenceTests.cs
@@ -2,9 +2,13 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using ApprovalTests;
+using ApprovalTests.Namers;
+using ApprovalTests.Reporters;
 using FluentAssertions;
 using Microsoft.ML.Data;
 using Microsoft.ML.TestFramework;
+using Newtonsoft.Json;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -222,5 +226,19 @@ public void InferColumnsFromMultilineInputFile()
             Assert.Equal("description", result.ColumnInformation.TextColumnNames.First());
             Assert.Equal("animal", result.ColumnInformation.CategoricalColumnNames.First());
         }
+
+        [Fact]
+        [UseReporter(typeof(DiffReporter))]
+        [UseApprovalSubdirectory("ApprovalTests")]
+        public void Wiki_column_inference_result_should_be_serializable()
+        {
+            var wiki = Path.Combine("TestData", "wiki-column-inference.json");
+            using (var stream = new StreamReader(wiki))
+            {
+                var json = stream.ReadToEnd();
+                var columnInferenceResults = JsonConvert.DeserializeObject<ColumnInferenceResults>(json);
+                Approvals.Verify(JsonConvert.SerializeObject(columnInferenceResults, Formatting.Indented));
+            }
+        }
     }
 }
diff --git a/test/Microsoft.ML.AutoML.Tests/Microsoft.ML.AutoML.Tests.csproj b/test/Microsoft.ML.AutoML.Tests/Microsoft.ML.AutoML.Tests.csproj
index 2800f55994..fad409f5f0 100644
--- a/test/Microsoft.ML.AutoML.Tests/Microsoft.ML.AutoML.Tests.csproj
+++ b/test/Microsoft.ML.AutoML.Tests/Microsoft.ML.AutoML.Tests.csproj
@@ -7,30 +7,13 @@
   </ItemGroup>
   
   <ItemGroup>
+    <PackageReference Include="ApprovalTests" Version="5.2.4" />
     <PackageReference Include="FluentAssertions" Version="5.10.3" />
     <PackageReference Include="SciSharp.TensorFlow.Redist" Version="$(TensorFlowVersion)" />
   </ItemGroup>
   
   <ItemGroup>
-    <None Update="TestData\DatasetWithNewlineBetweenQuotes.txt">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-    <None Update="TestData\DatasetWithDefaultColumnNames.txt">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-    <None Update="TestData\DatasetWithoutHeader.txt">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-    <None Update="TestData\NameColumnIsOnlyFeatureDataset.txt">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-    <None Update="TestData\BinaryDatasetWithBoolColumn.txt">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-    <None Update="TestData\DatasetWithEmptyColumn.txt">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
-    <None Update="TestData\TrivialMulticlassDataset.txt">
+    <None Update="TestData\**\*">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
     <None Update="xunit.runner.json">
diff --git a/test/Microsoft.ML.AutoML.Tests/TestData/wiki-column-inference.json b/test/Microsoft.ML.AutoML.Tests/TestData/wiki-column-inference.json
new file mode 100644
index 0000000000..79c9e98a07
--- /dev/null
+++ b/test/Microsoft.ML.AutoML.Tests/TestData/wiki-column-inference.json
@@ -0,0 +1,66 @@
+{
+  "TextLoaderOptions": {
+    "AllowQuoting": true,
+    "AllowSparse": false,
+    "InputSize": null,
+    "Separators": [
+      "\t"
+    ],
+    "DecimalMarker": ".",
+    "Columns": [
+      {
+        "Name": "Sentiment",
+        "Source": [
+          {
+            "Min": 0,
+            "Max": 0,
+            "AutoEnd": false,
+            "VariableEnd": false,
+            "AllOther": false,
+            "ForceVector": false
+          }
+        ],
+        "KeyCount": null,
+        "DataKind": 11
+      },
+      {
+        "Name": "SentimentText",
+        "Source": [
+          {
+            "Min": 1,
+            "Max": 1,
+            "AutoEnd": false,
+            "VariableEnd": false,
+            "AllOther": false,
+            "ForceVector": false
+          }
+        ],
+        "KeyCount": null,
+        "DataKind": 11
+      }
+    ],
+    "TrimWhitespace": false,
+    "HasHeader": true,
+    "UseThreads": true,
+    "ReadMultilines": false,
+    "HeaderFile": null,
+    "MaxRows": null,
+    "EscapeChar": "\"",
+    "MissingRealsAsNaNs": false
+  },
+  "ColumnInformation": {
+    "LabelColumnName": "Sentiment",
+    "UserIdColumnName": null,
+    "GroupIdColumnName": null,
+    "ItemIdColumnName": null,
+    "ExampleWeightColumnName": null,
+    "SamplingKeyColumnName": null,
+    "CategoricalColumnNames": [],
+    "NumericColumnNames": [],
+    "TextColumnNames": [
+      "SentimentText"
+    ],
+    "IgnoredColumnNames": [],
+    "ImagePathColumnNames": []
+  }
+}
\ No newline at end of file