Added middleware test for forwarded requests

Author: michaelstaib

src/AspNetCore.Tests/QueryMiddlewareTests.cs

@@ -56,6 +56,21 @@ public async Task HttpGet_BasicTest()
             Assert.Equal(Snapshot.Current(), Snapshot.New(result));
         }
 
+        [Fact]
+        public async Task HttpGet_ForwardToNextMiddleware()
+        {
+            // arrange
+            TestServer server = CreateTestServer();
+            string query = "{ basic { a } }";
+
+            // act
+            HttpResponseMessage message = await server.CreateClient()
+                .GetAsync($"http://localhost:5000/1234");
+
+            // assert
+            Assert.Equal(HttpStatusCode.NotFound, message.StatusCode);
+        }
+
         [Fact]
         public async Task HttpPost_WithScalarVariables()
         {