Making the reporing channel port discovery and accept incoming connections separate. Before we were hanging when creating the reporting channel and never starting the test runner.

test/dotnet-test.UnitTests/GivenATestExecutionGetTestRunnerProcessStartInfoMessageHandler.cs

@@ -148,6 +148,16 @@ namespace Microsoft.Dotnet.Tools.Test.Tests
             _reportingChannelFactoryMock.Verify(r => r.CreateChannelWithAnyAvailablePort(), Times.Once);
         }
 
+        [Fact]
+        public void It_calls_accept_on_the_test_runner_channel()
+        {
+            _testGetTestRunnerProcessStartInfoMessageHandler.HandleMessage(
+                    _dotnetTestMock.Object,
+                    _validMessage);
+
+            _testRunnerChannelMock.Verify(t => t.Accept(), Times.Once);
+        }
+
         [Fact]
         public void It_makes_dotnet_test_listen_on_the_test_runner_port_for_messages_when_it_handles_the_message()
         {