Improved rate limiting tests (#45541)

* #43298 - Improved rate limiting tests

* Code review fixes: Removed project from filter, renamed file

Author: MadL1me

src/Middleware/Middleware.slnf

@@ -125,6 +125,7 @@
       "src\\Servers\\Kestrel\\Kestrel\\src\\Microsoft.AspNetCore.Server.Kestrel.csproj",
       "src\\Servers\\Kestrel\\Transport.Quic\\src\\Microsoft.AspNetCore.Server.Kestrel.Transport.Quic.csproj",
       "src\\Servers\\Kestrel\\Transport.Sockets\\src\\Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.csproj",
+      "src\\Testing\\src\\Microsoft.AspNetCore.Testing.csproj",
       "src\\WebEncoders\\src\\Microsoft.Extensions.WebEncoders.csproj"
     ]
   }

src/Middleware/RateLimiting/test/RateLimiterEndpointConventionBuilderExtensionsTests.cs

@@ -73,22 +73,4 @@ public void DisableRateLimiting_MetadataAdded()
         var metadata = endpoint.Metadata.GetMetadata<DisableRateLimitingAttribute>();
         Assert.NotNull(metadata);
     }
-
-    private class TestEndpointBuilder : EndpointBuilder
-    {
-        public override Endpoint Build()
-        {
-            return new Endpoint(RequestDelegate, new EndpointMetadataCollection(Metadata), DisplayName);
-        }
-    }
-
-    private class TestEndpointConventionBuilder : IEndpointConventionBuilder
-    {
-        public IList<Action<EndpointBuilder>> Conventions { get; } = new List<Action<EndpointBuilder>>();
-
-        public void Add(Action<EndpointBuilder> convention)
-        {
-            Conventions.Add(convention);
-        }
-    }
 }