Removed unused code in tests

Author: Bart Koelman

Diff for: src/JsonApiDotNetCore/Serialization/JsonApiWriter.cs

@@ -11,7 +11,6 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Formatters;
 using Microsoft.Extensions.Logging;
-using Newtonsoft.Json;
 
 namespace JsonApiDotNetCore.Serialization
 {

Diff for: test/JsonApiDotNetCoreExampleTests/IntegrationTests/ReadWrite/Creating/CreateResourceWithToManyRelationshipTests.cs

@@ -2,10 +2,8 @@
 using System.Net;
 using System.Threading.Tasks;
 using FluentAssertions;
-using JsonApiDotNetCore.Configuration;
 using JsonApiDotNetCore.Serialization.Objects;
 using Microsoft.EntityFrameworkCore;
-using Microsoft.Extensions.DependencyInjection;
 using Xunit;
 
 namespace JsonApiDotNetCoreExampleTests.IntegrationTests.ReadWrite.Creating
@@ -19,9 +17,6 @@ public sealed class CreateResourceWithToManyRelationshipTests
         public CreateResourceWithToManyRelationshipTests(IntegrationTestContext<TestableStartup<ReadWriteDbContext>, ReadWriteDbContext> testContext)
         {
             _testContext = testContext;
-
-            var options = (JsonApiOptions) testContext.Factory.Services.GetRequiredService<IJsonApiOptions>();
-            options.AllowClientGeneratedIds = true;
         }
 
         [Fact]

Diff for: test/JsonApiDotNetCoreExampleTests/IntegrationTests/ReadWrite/Updating/Resources/UpdateResourceTests.cs

@@ -4,11 +4,9 @@
 using System.Net;
 using System.Threading.Tasks;
 using FluentAssertions;
-using JsonApiDotNetCore.Configuration;
 using JsonApiDotNetCore.Resources;
 using JsonApiDotNetCore.Serialization.Objects;
 using Microsoft.EntityFrameworkCore;
-using Microsoft.Extensions.DependencyInjection;
 using Xunit;
 
 namespace JsonApiDotNetCoreExampleTests.IntegrationTests.ReadWrite.Updating.Resources
@@ -22,10 +20,6 @@ public sealed class UpdateResourceTests
         public UpdateResourceTests(IntegrationTestContext<TestableStartup<ReadWriteDbContext>, ReadWriteDbContext> testContext)
         {
             _testContext = testContext;
-
-            var options = (JsonApiOptions) testContext.Factory.Services.GetRequiredService<IJsonApiOptions>();
-            options.UseRelativeLinks = false;
-            options.AllowClientGeneratedIds = false;
         }
 
         [Fact]