Fix tests and lint errors

Author: desjoerd

src/OpenApi/src/Services/Schemas/OpenApiSchemaService.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Collections.Concurrent;
-using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 using System.Diagnostics;
 using System.IO.Pipelines;

src/OpenApi/src/Services/Schemas/Transformers/DescriptionDataAnnotationsSchemaTransformer.cs

@@ -1,7 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-
 using System.ComponentModel;
 using System.Linq;
 using System.Text.Json;

src/OpenApi/test/Microsoft.AspNetCore.OpenApi.Tests/Transformers/OpenApiOptionsTests.cs

@@ -10,6 +10,8 @@ public void AddDocumentTransformer_WithDocumentTransformerDelegate()
     {
         // Arrange
         var options = new OpenApiOptions();
+        RemoveBuiltInTransformers(options);
+
         var transformer = new Func<OpenApiDocument, OpenApiDocumentTransformerContext, CancellationToken, Task>((document, context, cancellationToken) =>
         {
             document.Info.Title = "New Title";
@@ -32,6 +34,8 @@ public void AddDocumentTransformer_WithDocumentTransformerInstance()
     {
         // Arrange
         var options = new OpenApiOptions();
+        RemoveBuiltInTransformers(options);
+
         var transformer = new TestOpenApiDocumentTransformer();
 
         // Act
@@ -50,6 +54,7 @@ public void AddDocumentTransformer_WithDocumentTransformerType()
     {
         // Arrange
         var options = new OpenApiOptions();
+        RemoveBuiltInTransformers(options);
 
         // Act
         var result = options.AddDocumentTransformer<TestOpenApiDocumentTransformer>();
@@ -67,6 +72,8 @@ public void AddOperationTransformer_WithOperationTransformerDelegate()
     {
         // Arrange
         var options = new OpenApiOptions();
+        RemoveBuiltInTransformers(options);
+
         var transformer = new Func<OpenApiOperation, OpenApiOperationTransformerContext, CancellationToken, Task>((operation, context, cancellationToken) =>
         {
             operation.Description = "New Description";
@@ -89,6 +96,8 @@ public void AddOperationTransformer_WithOperationTransformerInstance()
     {
         // Arrange
         var options = new OpenApiOptions();
+        RemoveBuiltInTransformers(options);
+
         var transformer = new TestOpenApiOperationTransformer();
 
         // Act
@@ -107,6 +116,7 @@ public void AddOperationTransformer_WithOperationTransformerType()
     {
         // Arrange
         var options = new OpenApiOptions();
+        RemoveBuiltInTransformers(options);
 
         // Act
         var result = options.AddOperationTransformer<TestOpenApiOperationTransformer>();
@@ -124,6 +134,8 @@ public void AddSchemaTransformer_WithSchemaTransformerDelegate()
     {
         // Arrange
         var options = new OpenApiOptions();
+        RemoveBuiltInTransformers(options);
+
         var transformer = new Func<OpenApiSchema, OpenApiSchemaTransformerContext, CancellationToken, Task>((schema, context, cancellationToken) =>
         {
             schema.Description = "New Description";
@@ -146,6 +158,8 @@ public void AddSchemaTransformer_WithSchemaTransformerInstance()
     {
         // Arrange
         var options = new OpenApiOptions();
+        RemoveBuiltInTransformers(options);
+
         var transformer = new TestOpenApiSchemaTransformer();
 
         // Act
@@ -164,6 +178,7 @@ public void AddSchemaTransformer_WithSchemaTransformerType()
     {
         // Arrange
         var options = new OpenApiOptions();
+        RemoveBuiltInTransformers(options);
 
         // Act
         var result = options.AddSchemaTransformer<TestOpenApiSchemaTransformer>();
@@ -176,6 +191,13 @@ public void AddSchemaTransformer_WithSchemaTransformerType()
         Assert.Empty(options.OperationTransformers);
     }
 
+    private static void RemoveBuiltInTransformers(OpenApiOptions options)
+    {
+        options.DocumentTransformers.Clear();
+        options.OperationTransformers.Clear();
+        options.SchemaTransformers.Clear();
+    }
+
     private class TestOpenApiDocumentTransformer : IOpenApiDocumentTransformer
     {
         public Task TransformAsync(OpenApiDocument document, OpenApiDocumentTransformerContext context, CancellationToken cancellationToken)