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diff --git a/src/csharp/Grpc.Examples.Tests/MathClientMockableTest.cs b/src/csharp/Grpc.Examples.Tests/MathClientMockableTest.cs
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+++ b/src/csharp/Grpc.Examples.Tests/MathClientMockableTest.cs
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+#region Copyright notice and license
+
+// Copyright 2018 The gRPC Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#endregion
+
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Testing;
+using NUnit.Framework;
+
+namespace Math.Tests
+{
+    /// <summary>
+    /// Demonstrates how to mock method stubs for all method types in a generated client.
+    /// </summary>
+    public class MathClientMockableTest
+    {
+        [Test]
+        public void ClientBaseBlockingUnaryCallCanBeMocked()
+        {
+            var mockClient = new Moq.Mock<Math.MathClient>();
+            
+            var expected = new DivReply();
+            mockClient.Setup(m => m.Div(Moq.It.IsAny<DivArgs>(), null, null, CancellationToken.None)).Returns(expected);
+            Assert.AreSame(expected, mockClient.Object.Div(new DivArgs()));
+        }
+
+        [Test]
+        public void ClientBaseBlockingUnaryCallWithCallOptionsCallCanBeMocked()
+        {
+            var mockClient = new Moq.Mock<Math.MathClient>();
+
+            var expected = new DivReply();
+            mockClient.Setup(m => m.Div(Moq.It.IsAny<DivArgs>(), Moq.It.IsAny<CallOptions>())).Returns(expected);
+            Assert.AreSame(expected, mockClient.Object.Div(new DivArgs(), new CallOptions()));
+        }
+
+        [Test]
+        public void ClientBaseAsyncUnaryCallCanBeMocked()
+        {
+            var mockClient = new Moq.Mock<Math.MathClient>();
+
+            // Use a factory method provided by Grpc.Core.Testing.TestCalls to create an instance of a call.
+            var fakeCall = TestCalls.AsyncUnaryCall<DivReply>(Task.FromResult(new DivReply()), Task.FromResult(new Metadata()), () => Status.DefaultSuccess, () => new Metadata(), () => { });
+            mockClient.Setup(m => m.DivAsync(Moq.It.IsAny<DivArgs>(), null, null, CancellationToken.None)).Returns(fakeCall);
+            Assert.AreSame(fakeCall, mockClient.Object.DivAsync(new DivArgs()));
+        }
+
+        [Test]
+        public void ClientBaseClientStreamingCallCanBeMocked()
+        {
+            var mockClient = new Moq.Mock<Math.MathClient>();
+            var mockRequestStream = new Moq.Mock<IClientStreamWriter<Num>>();
+
+            // Use a factory method provided by Grpc.Core.Testing.TestCalls to create an instance of a call.
+            var fakeCall = TestCalls.AsyncClientStreamingCall<Num, Num>(mockRequestStream.Object, Task.FromResult(new Num()), Task.FromResult(new Metadata()), () => Status.DefaultSuccess, () => new Metadata(), () => { });
+            mockClient.Setup(m => m.Sum(null, null, CancellationToken.None)).Returns(fakeCall);
+            Assert.AreSame(fakeCall, mockClient.Object.Sum());
+        }
+
+        [Test]
+        public void ClientBaseServerStreamingCallCanBeMocked()
+        {
+            var mockClient = new Moq.Mock<Math.MathClient>();
+            var mockResponseStream = new Moq.Mock<IAsyncStreamReader<Num>>();
+
+            // Use a factory method provided by Grpc.Core.Testing.TestCalls to create an instance of a call.
+            var fakeCall = TestCalls.AsyncServerStreamingCall<Num>(mockResponseStream.Object, Task.FromResult(new Metadata()), () => Status.DefaultSuccess, () => new Metadata(), () => { });
+            mockClient.Setup(m => m.Fib(Moq.It.IsAny<FibArgs>(), null, null, CancellationToken.None)).Returns(fakeCall);
+            Assert.AreSame(fakeCall, mockClient.Object.Fib(new FibArgs()));
+        }
+
+        [Test]
+        public void ClientBaseDuplexStreamingCallCanBeMocked()
+        {
+            var mockClient = new Moq.Mock<Math.MathClient>();
+            var mockRequestStream = new Moq.Mock<IClientStreamWriter<DivArgs>>();
+            var mockResponseStream = new Moq.Mock<IAsyncStreamReader<DivReply>>();
+
+            // Use a factory method provided by Grpc.Core.Testing.TestCalls to create an instance of a call.
+            var fakeCall = TestCalls.AsyncDuplexStreamingCall<DivArgs, DivReply>(mockRequestStream.Object, mockResponseStream.Object, Task.FromResult(new Metadata()), () => Status.DefaultSuccess, () => new Metadata(), () => { });
+            mockClient.Setup(m => m.DivMany(null, null, CancellationToken.None)).Returns(fakeCall);
+            Assert.AreSame(fakeCall, mockClient.Object.DivMany());
+        }
+    }
+}