Fix flaky test by ignoring indeterminant response

Author: John Luo

test/Kestrel.FunctionalTests/ChunkedRequestTests.cs

@@ -678,7 +678,7 @@ await connection.SendAll(
 
                     connection.Socket.Shutdown(SocketShutdown.Send);
 
-                    await connection.ReceiveEnd();
+                    await connection.ReceiveEnd(ignoreResponse: true);
 
                     var badReqEx = await exTcs.Task.TimeoutAfter(TestConstants.DefaultTimeout);
                     Assert.Equal(RequestRejectionReason.UnexpectedEndOfRequestContent, badReqEx.Reason);

test/shared/TestConnection.cs

@@ -149,14 +149,20 @@ public async Task Receive(params string[] lines)
             Assert.Equal(expected, new string(actual, 0, offset));
         }
 
-        public async Task ReceiveEnd(params string[] lines)
+        public Task ReceiveEnd(params string[] lines)
+            => ReceiveEnd(false, lines);
+
+        public async Task ReceiveEnd(bool ignoreResponse, params string[] lines)
         {
             await Receive(lines).ConfigureAwait(false);
             _socket.Shutdown(SocketShutdown.Send);
             var ch = new char[128];
             var count = await _reader.ReadAsync(ch, 0, 128).TimeoutAfter(Timeout).ConfigureAwait(false);
-            var text = new string(ch, 0, count);
-            Assert.Equal("", text);
+            if (!ignoreResponse)
+            {
+                var text = new string(ch, 0, count);
+                Assert.Equal("", text);
+            }
         }
 
         public async Task ReceiveForcedEnd(params string[] lines)