allow halfclose after close on clients
diff --git a/src/csharp/tests.json b/src/csharp/tests.json
index 4aa9366..d66cb1b 100644
--- a/src/csharp/tests.json
+++ b/src/csharp/tests.json
@@ -21,6 +21,7 @@
     "Grpc.Core.Tests.CompressionTest",
     "Grpc.Core.Tests.ContextPropagationTest",
     "Grpc.Core.Tests.GrpcEnvironmentTest",
+    "Grpc.Core.Tests.HalfcloseTest",
     "Grpc.Core.Tests.MarshallingErrorsTest",
     "Grpc.Core.Tests.MetadataTest",
     "Grpc.Core.Tests.NUnitVersionTest",