Index: Src/GoogleApis.Auth.Tests/OAuth2/Requests/RefreshTokenRequestTests.cs
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new file mode 100644
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+++ b/Src/GoogleApis.Auth.Tests/OAuth2/Requests/RefreshTokenRequestTests.cs
@@ -0,0 +1,44 @@
+/*
+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;
+
+namespace Google.Apis.Auth.OAuth2.Requests
+{
+    /// <summary>
+    /// Tests for <seealso cref="Google.Apis.Auth.OAuth2.Requests.RefreshTokenRequest"/>.
+    /// </summary>
+    [TestFixture]
+    public class RefreshTokenRequestTests
+    {
+        [Test]
+        public void TestConstructor()
+        {
+            var request = new RefreshTokenRequest();
+            Assert.Null(request.Scope);
+            Assert.Null(request.ClientId);
+            Assert.Null(request.ClientSecret);
+
+            Assert.Null(request.RefreshToken);
+            Assert.That(request.GrantType, Is.EqualTo("refresh_token"));
+        }
+    }
+}