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diff --git a/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs b/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
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+#region Copyright notice and license
+
+// Copyright 2015, 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.Threading;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace math.Tests
+{
+    /// <summary>
+    /// Math client talks to local math server.
+    /// </summary>
+    public class MathClientServerTest
+    {
+        string host = "localhost";
+        Server server;
+        Channel channel;
+        MathGrpc.IMathServiceClient client;
+
+        [TestFixtureSetUp]
+        public void Init()
+        {
+            GrpcEnvironment.Initialize();
+
+            server = new Server();
+            server.AddServiceDefinition(MathGrpc.BindService(new MathServiceImpl()));
+            int port = server.AddPort(host + ":0");
+            server.Start();
+            channel = new Channel(host + ":" + port);
+            client = MathGrpc.NewStub(channel);
+        }
+
+        [TestFixtureTearDown]
+        public void Cleanup()
+        {
+            channel.Dispose();
+
+            server.ShutdownAsync().Wait();
+            GrpcEnvironment.Shutdown();
+        }
+
+        [Test]
+        public void Div1()
+        {
+            DivReply response = client.Div(new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build());
+            Assert.AreEqual(3, response.Quotient);
+            Assert.AreEqual(1, response.Remainder);
+        }
+
+        [Test]
+        public void Div2()
+        {
+            DivReply response = client.Div(new DivArgs.Builder { Dividend = 0, Divisor = 1 }.Build());
+            Assert.AreEqual(0, response.Quotient);
+            Assert.AreEqual(0, response.Remainder);
+        }
+
+        // TODO: test division by zero
+
+        [Test]
+        public void DivAsync()
+        {
+            DivReply response = client.DivAsync(new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build()).Result;
+            Assert.AreEqual(3, response.Quotient);
+            Assert.AreEqual(1, response.Remainder);
+        }
+
+        [Test]
+        public void Fib()
+        {
+            var recorder = new RecordingObserver<Num>();
+            client.Fib(new FibArgs.Builder { Limit = 6 }.Build(), recorder);
+
+            CollectionAssert.AreEqual(new List<long>{1, 1, 2, 3, 5, 8},
+                recorder.ToList().Result.ConvertAll((n) => n.Num_));
+        }
+
+        // TODO: test Fib with limit=0 and cancellation
+        [Test]
+        public void Sum()
+        {
+            var res = client.Sum();
+            foreach (var num in new long[] { 10, 20, 30 }) {
+                res.Inputs.OnNext(Num.CreateBuilder().SetNum_(num).Build());
+            }
+            res.Inputs.OnCompleted();
+
+            Assert.AreEqual(60, res.Task.Result.Num_);
+        }
+
+        [Test]
+        public void DivMany()
+        {
+            List<DivArgs> divArgsList = new List<DivArgs>{
+                new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build(),
+                new DivArgs.Builder { Dividend = 100, Divisor = 21 }.Build(),
+                new DivArgs.Builder { Dividend = 7, Divisor = 2 }.Build()
+            };
+
+            var recorder = new RecordingObserver<DivReply>();
+            var requestObserver = client.DivMany(recorder);
+
+            foreach (var arg in divArgsList)
+            {
+                requestObserver.OnNext(arg);
+            }
+            requestObserver.OnCompleted();
+
+            var result = recorder.ToList().Result;
+
+            CollectionAssert.AreEqual(new long[] {3, 4, 3}, result.ConvertAll((divReply) => divReply.Quotient));
+            CollectionAssert.AreEqual(new long[] {1, 16, 1}, result.ConvertAll((divReply) => divReply.Remainder));
+        }
+    }
+}
+