Index: Src/GoogleApis.Auth.Tests/OAuth2/Responses/TokenResponseTests.cs
===================================================================
new file mode 100644
--- /dev/null
+++ b/Src/GoogleApis.Auth.Tests/OAuth2/Responses/TokenResponseTests.cs
@@ -0,0 +1,109 @@
+/*
+Copyright 2013 Google Inc
+
+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.
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using NUnit.Framework;
+using Newtonsoft.Json;
+
+using Google.Apis.Tests;
+
+namespace Google.Apis.Auth.OAuth2.Responses
+{
+    /// <summary>
+    /// Tests for <seealso cref="Google.Apis.Google.Apis.Auth.OAuth2.Responses.TokenResponse"/>.
+    /// </summary>
+    [TestFixture]
+    public class TokenResponseTests
+    {
+        [Test]
+        public void TestConstructor()
+        {
+            var response = new TokenResponse();
+            Assert.Null(response.AccessToken);
+            Assert.Null(response.ExpiresInSeconds);
+            Assert.Null(response.RefreshToken);
+            Assert.Null(response.Scope);
+            Assert.AreEqual(DateTime.MinValue, response.Issued);
+        }
+
+        [Test]
+        public void TestSerializer()
+        {
+            var tokenResponse = JsonConvert.DeserializeObject<TokenResponse>(
+                @"{
+                 'access_token': '123',
+                 'expires_in': 1000,
+                 'refresh_token': '456',
+                 'scope': '789'
+                }");
+            Assert.That(tokenResponse.AccessToken, Is.EqualTo("123"));
+            Assert.That(tokenResponse.RefreshToken, Is.EqualTo("456"));
+            Assert.That(tokenResponse.Scope, Is.EqualTo("789"));
+            Assert.That(tokenResponse.ExpiresInSeconds, Is.EqualTo(1000));
+        }
+
+        [Test]
+        public void IsExpired_True()
+        {
+            var issued = DateTime.Now;
+            var newNow = DateTime.Now.AddSeconds(200);
+
+            var mockClock = new MockClock()
+                {
+                    Now = newNow
+                };
+
+            // Issued not set.
+            var response = new TokenResponse();
+            Assert.True(response.IsExpired(mockClock));
+
+            // ExpiresInSeconds is not set.
+            response = new TokenResponse() { Issued = issued };
+            Assert.True(response.IsExpired(mockClock));
+
+            response = new TokenResponse() { ExpiresInSeconds = 1, Issued = issued };
+            Assert.True(response.IsExpired(mockClock));
+
+            response = new TokenResponse() { ExpiresInSeconds = 100, Issued = issued };
+            Assert.True(response.IsExpired(mockClock));
+
+            response = new TokenResponse() { ExpiresInSeconds = 140, Issued = issued };
+            Assert.True(response.IsExpired(mockClock));
+        }
+
+        [Test]
+        public void IsExpired_False()
+        {
+            var issued = DateTime.Now;
+            var newNow = DateTime.Now.AddSeconds(200);
+
+            var mockClock = new MockClock()
+            {
+                Now = newNow
+            };
+
+            var response = new TokenResponse() { ExpiresInSeconds = 141, Issued = issued };
+            Assert.False(response.IsExpired(mockClock));
+
+            response = new TokenResponse() { ExpiresInSeconds = 142, Issued = issued };
+            Assert.False(response.IsExpired(mockClock));
+        }
+    }
+}