diff --git a/test/Microsoft.OpenApi.Hidi.Tests/Microsoft.OpenApi.Hidi.Tests.csproj b/test/Microsoft.OpenApi.Hidi.Tests/Microsoft.OpenApi.Hidi.Tests.csproj
index d4e045b01..8ea740315 100644
--- a/test/Microsoft.OpenApi.Hidi.Tests/Microsoft.OpenApi.Hidi.Tests.csproj
+++ b/test/Microsoft.OpenApi.Hidi.Tests/Microsoft.OpenApi.Hidi.Tests.csproj
@@ -14,7 +14,7 @@
-
+
diff --git a/test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiFilterServiceTests.cs b/test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiFilterServiceTests.cs
index 0f353b326..5fb1b15f9 100644
--- a/test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiFilterServiceTests.cs
+++ b/test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiFilterServiceTests.cs
@@ -35,7 +35,7 @@ public OpenApiFilterServiceTests()
[InlineData(null, "users.user", 2)]
[InlineData(null, "applications.application", 1)]
[InlineData(null, "reports.Functions", 2)]
- public void ReturnFilteredOpenApiDocumentBasedOnOperationIdsAndTags(string operationIds, string tags, int expectedPathCount)
+ public void ReturnFilteredOpenApiDocumentBasedOnOperationIdsAndTags(string? operationIds, string? tags, int expectedPathCount)
{
// Act
var predicate = OpenApiFilterService.CreatePredicate(operationIds, tags);
@@ -173,7 +173,7 @@ public void ThrowsInvalidOperationExceptionInCreatePredicateWhenInvalidArguments
[Theory]
[InlineData("reports.getTeamsUserActivityUserDetail-a3f1", null)]
[InlineData(null, "reports.Functions")]
- public void ReturnsPathParametersOnSlicingBasedOnOperationIdsOrTags(string operationIds, string tags)
+ public void ReturnsPathParametersOnSlicingBasedOnOperationIdsOrTags(string? operationIds, string? tags)
{
// Act
var predicate = OpenApiFilterService.CreatePredicate(operationIds, tags);
diff --git a/test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiServiceTests.cs b/test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiServiceTests.cs
index 2844849e0..f7c5aab45 100644
--- a/test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiServiceTests.cs
+++ b/test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiServiceTests.cs
@@ -47,7 +47,7 @@ public async Task ReturnConvertedCSDLFile()
[InlineData("Todos.Todo.UpdateTodo", null, 1)]
[InlineData("Todos.Todo.ListTodo", null, 1)]
[InlineData(null, "Todos.Todo", 5)]
- public async Task ReturnFilteredOpenApiDocBasedOnOperationIdsAndInputCsdlDocument(string operationIds, string tags, int expectedPathCount)
+ public async Task ReturnFilteredOpenApiDocBasedOnOperationIdsAndInputCsdlDocument(string? operationIds, string? tags, int expectedPathCount)
{
// Arrange
var filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "UtilityFiles", "Todo.xml");
@@ -68,7 +68,7 @@ public async Task ReturnFilteredOpenApiDocBasedOnOperationIdsAndInputCsdlDocumen
[Theory]
[InlineData("UtilityFiles/appsettingstest.json")]
[InlineData(null)]
- public void ReturnOpenApiConvertSettingsWhenSettingsFileIsProvided(string filePath)
+ public void ReturnOpenApiConvertSettingsWhenSettingsFileIsProvided(string? filePath)
{
// Arrange
var config = SettingsUtilities.GetConfiguration(filePath);
diff --git a/test/Microsoft.OpenApi.Readers.Tests/Microsoft.OpenApi.Readers.Tests.csproj b/test/Microsoft.OpenApi.Readers.Tests/Microsoft.OpenApi.Readers.Tests.csproj
index d18604607..ca7586232 100644
--- a/test/Microsoft.OpenApi.Readers.Tests/Microsoft.OpenApi.Readers.Tests.csproj
+++ b/test/Microsoft.OpenApi.Readers.Tests/Microsoft.OpenApi.Readers.Tests.csproj
@@ -21,7 +21,7 @@
-
+
diff --git a/test/Microsoft.OpenApi.SmokeTests/Microsoft.OpenApi.SmokeTests.csproj b/test/Microsoft.OpenApi.SmokeTests/Microsoft.OpenApi.SmokeTests.csproj
index 260353264..1f6d93401 100644
--- a/test/Microsoft.OpenApi.SmokeTests/Microsoft.OpenApi.SmokeTests.csproj
+++ b/test/Microsoft.OpenApi.SmokeTests/Microsoft.OpenApi.SmokeTests.csproj
@@ -12,7 +12,7 @@
-
+
diff --git a/test/Microsoft.OpenApi.Tests/Microsoft.OpenApi.Tests.csproj b/test/Microsoft.OpenApi.Tests/Microsoft.OpenApi.Tests.csproj
index 29abbaab7..c234da25a 100644
--- a/test/Microsoft.OpenApi.Tests/Microsoft.OpenApi.Tests.csproj
+++ b/test/Microsoft.OpenApi.Tests/Microsoft.OpenApi.Tests.csproj
@@ -16,7 +16,7 @@
-
+