1 files changed, 34 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers.Test/TestCornerCases.cs b/csharp/src/ProtocolBuffers.Test/TestCornerCases.cs
new file mode 100644
index 00000000..b60e7fae
--- /dev/null
+++ b/csharp/src/ProtocolBuffers.Test/TestCornerCases.cs
@@ -0,0 +1,34 @@
+using UnitTest.Issues.TestProtos;
+using NUnit.Framework;
+
+namespace Google.ProtocolBuffers
+{
+    public class TestCornerCases
+    {
+        [Test]
+        public void TestRoundTripNegativeEnums()
+        {
+            NegativeEnumMessage msg = NegativeEnumMessage.CreateBuilder()
+                .SetValue(NegativeEnum.MinusOne) //11
+                .AddValues(NegativeEnum.Zero) //2
+                .AddValues(NegativeEnum.MinusOne) //11
+                .AddValues(NegativeEnum.FiveBelow) //11
+                //2
+                .AddPackedValues(NegativeEnum.Zero) //1
+                .AddPackedValues(NegativeEnum.MinusOne) //10
+                .AddPackedValues(NegativeEnum.FiveBelow) //10
+                .Build();
+
+            Assert.AreEqual(58, msg.SerializedSize);
+
+            byte[] bytes = new byte[58];
+            CodedOutputStream output = CodedOutputStream.CreateInstance(bytes);
+
+            msg.WriteTo(output);
+            Assert.AreEqual(0, output.SpaceLeft);
+
+            NegativeEnumMessage copy = NegativeEnumMessage.ParseFrom(bytes);
+            Assert.AreEqual(msg, copy);
+        }
+    }
+}