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diff --git a/csharp/src/ProtocolBuffers.Test/WellKnownTypes/WrappersTest.cs b/csharp/src/ProtocolBuffers.Test/WellKnownTypes/WrappersTest.cs
new file mode 100644
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+++ b/csharp/src/ProtocolBuffers.Test/WellKnownTypes/WrappersTest.cs
@@ -0,0 +1,85 @@
+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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 Google.Protobuf.TestProtos;
+using NUnit.Framework;
+
+namespace Google.Protobuf.WellKnownTypes
+{
+    public class WrappersTest
+    {
+        [Test]
+        public void NullIsDefault()
+        {
+            var message = new TestWellKnownTypes();
+            Assert.IsNull(message.StringField);
+            Assert.IsNull(message.BytesField);
+            Assert.IsNull(message.BoolField);
+            Assert.IsNull(message.FloatField);
+            Assert.IsNull(message.DoubleField);
+            Assert.IsNull(message.Int32Field);
+            Assert.IsNull(message.Int64Field);
+            Assert.IsNull(message.Uint32Field);
+            Assert.IsNull(message.Uint64Field);
+        }
+
+        [Test]
+        public void NonNullDefaultIsPreservedThroughSerialization()
+        {
+            var message = new TestWellKnownTypes
+            {
+                StringField = "",
+                BytesField = ByteString.Empty,
+                BoolField = false,
+                FloatField = 0f,
+                DoubleField = 0d,
+                Int32Field = 0,
+                Int64Field = 0,
+                Uint32Field = 0,
+                Uint64Field = 0
+            };
+
+            var bytes = message.ToByteArray();
+            var parsed = TestWellKnownTypes.Parser.ParseFrom(bytes);
+
+            Assert.AreEqual("", message.StringField);
+            Assert.AreEqual(ByteString.Empty, message.BytesField);
+            Assert.AreEqual(false, message.BoolField);
+            Assert.AreEqual(0f, message.FloatField);
+            Assert.AreEqual(0d, message.DoubleField);
+            Assert.AreEqual(0, message.Int32Field);
+            Assert.AreEqual(0L, message.Int64Field);
+            Assert.AreEqual(0U, message.Uint32Field);
+            Assert.AreEqual(0UL, message.Uint64Field);
+        }
+    }
+}