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+#region Copyright notice and license
+
+// Copyright 2016, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+using Grpc.Core;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+
+using NUnit.Framework;
+
+namespace Grpc.Core.Tests
+{
+ public class HalfcloseTest
+ {
+ MockServiceHelper helper;
+ Server server;
+ Channel channel;
+
+ [SetUp]
+ public void Init()
+ {
+ helper = new MockServiceHelper();
+
+ server = helper.GetServer();
+ server.Start();
+ channel = helper.GetChannel();
+ }
+
+ [TearDown]
+ public void Cleanup()
+ {
+ channel.ShutdownAsync().Wait();
+ server.ShutdownAsync().Wait();
+ }
+
+ /// <summary>
+ /// For client streaming and duplex streaming calls, if server does a full close
+ /// before we halfclose the request stream, an attempt to halfclose
+ /// (complete the request stream) shouldn't be treated as an error.
+ /// </summary>
+ [Test]
+ public async Task HalfcloseAfterFullclose_ClientStreamingCall()
+ {
+ helper.ClientStreamingHandler = new ClientStreamingServerMethod<string, string>(async (requestStream, context) =>
+ {
+ return "PASS";
+ });
+
+ var call = Calls.AsyncClientStreamingCall(helper.CreateClientStreamingCall());
+ // make sure server has fullclosed on us
+ Assert.AreEqual("PASS", await call.ResponseAsync);
+
+ // sending close from client should be still fine because server can finish
+ // the call anytime and we cannot do anything about it on the client side.
+ await call.RequestStream.CompleteAsync();
+
+ // Second attempt to close from client is not allowed.
+ Assert.Throws(typeof(InvalidOperationException), async () => await call.RequestStream.CompleteAsync());
+ }
+ }
+}