Testing
diff --git a/src/ProtocolBuffersLite.Test/InteropLiteTest.cs b/src/ProtocolBuffersLite.Test/InteropLiteTest.cs
new file mode 100644
index 0000000..30d696d
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+++ b/src/ProtocolBuffersLite.Test/InteropLiteTest.cs
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+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://github.com/jskeet/dotnet-protobufs/
+// Original C++/Java/Python code:
+// http://code.google.com/p/protobuf/
+//
+// 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 Google.ProtocolBuffers;
+using Google.ProtocolBuffers.TestProtos;
+using NUnit.Framework;
+
+namespace Google.ProtocolBuffers {
+  [TestFixture]
+  public class InteropLiteTest {
+
+    [Test]
+    public void TestConvertFromFullMinimal() {
+      TestInteropPerson person = TestInteropPerson.CreateBuilder()
+        .SetId(123)
+        .SetName("abc")
+        .Build();
+      Assert.IsTrue(person.IsInitialized);
+
+      TestInteropPersonLite copy = TestInteropPersonLite.ParseFrom(person.ToByteArray());
+
+      Assert.AreEqual(person.ToByteArray(), copy.ToByteArray());
+    }
+
+    [Test]
+    public void TestConvertFromFullComplete() {
+      TestInteropPerson person = TestInteropPerson.CreateBuilder()
+        .SetId(123)
+        .SetName("abc")
+        .SetEmail("abc@123.com")
+        .AddRangeCodes(new[] { 1, 2, 3 })
+        .AddPhone(TestInteropPerson.Types.PhoneNumber.CreateBuilder().SetNumber("555-1234").Build())
+        .AddPhone(TestInteropPerson.Types.PhoneNumber.CreateBuilder().SetNumber("555-5678").Build())
+        .AddAddresses(TestInteropPerson.Types.Addresses.CreateBuilder().SetAddress("123 Seseme").SetCity("Wonderland").SetState("NA").SetZip(12345).Build())
+        .SetExtension(UnitTestExtrasFullProtoFile.EmployeeId, TestInteropEmployeeId.CreateBuilder().SetNumber("123").Build())
+        .Build();
+      Assert.IsTrue(person.IsInitialized);
+
+      ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
+      UnitTestExtrasLiteProtoFile.RegisterAllExtensions(registry);
+
+      TestInteropPersonLite copy = TestInteropPersonLite.ParseFrom(person.ToByteArray(), registry);
+
+      Assert.AreEqual(person.ToByteArray(), copy.ToByteArray());
+    }
+
+    [Test]
+    public void TestConvertFromLiteMinimal() {
+      TestInteropPersonLite person = TestInteropPersonLite.CreateBuilder()
+        .SetId(123)
+        .SetName("abc")
+        .Build();
+      Assert.IsTrue(person.IsInitialized);
+
+      TestInteropPerson copy = TestInteropPerson.ParseFrom(person.ToByteArray());
+
+      Assert.AreEqual(person.ToByteArray(), copy.ToByteArray());
+    }
+
+    [Test]
+    public void TestConvertFromLiteComplete() {
+      TestInteropPersonLite person = TestInteropPersonLite.CreateBuilder()
+        .SetId(123)
+        .SetName("abc")
+        .SetEmail("abc@123.com")
+        .AddRangeCodes(new[] { 1, 2, 3 })
+        .AddPhone(TestInteropPersonLite.Types.PhoneNumber.CreateBuilder().SetNumber("555-1234").Build())
+        .AddPhone(TestInteropPersonLite.Types.PhoneNumber.CreateBuilder().SetNumber("555-5678").Build())
+        .AddAddresses(TestInteropPersonLite.Types.Addresses.CreateBuilder().SetAddress("123 Seseme").SetCity("Wonderland").SetState("NA").SetZip(12345).Build())
+        .SetExtension(UnitTestExtrasLiteProtoFile.EmployeeIdLite, TestInteropEmployeeIdLite.CreateBuilder().SetNumber("123").Build())
+        .Build();
+      Assert.IsTrue(person.IsInitialized);
+
+      ExtensionRegistry registry = ExtensionRegistry.CreateInstance();
+      UnitTestExtrasFullProtoFile.RegisterAllExtensions(registry);
+
+      TestInteropPerson copy = TestInteropPerson.ParseFrom(person.ToByteArray(), registry);
+
+      Assert.AreEqual(person.ToByteArray(), copy.ToByteArray());
+    }
+  }
+}