1 files changed, 15 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers.Test/FieldCodecTest.cs b/csharp/src/ProtocolBuffers.Test/FieldCodecTest.cs
index a14040d1..c6ed2a21 100644
--- a/csharp/src/ProtocolBuffers.Test/FieldCodecTest.cs
+++ b/csharp/src/ProtocolBuffers.Test/FieldCodecTest.cs
@@ -86,12 +86,22 @@ namespace Google.Protobuf
             codec.TestDefaultValue();
         }
 
+        [Test, TestCaseSource("Codecs")]
+        public void FixedSize(ICodecTestData codec)
+        {
+            codec.TestFixedSize();
+        }
+
+        // This is ugly, but it means we can have a non-generic interface.
+        // It feels like NUnit should support this better, but I don't know
+        // of any better ways right now.
         public interface ICodecTestData
         {
             void TestRoundTripRaw();
             void TestRoundTripWithTag();
             void TestCalculateSizeWithTag();
             void TestDefaultValue();
+            void TestFixedSize();
         }
 
         public class FieldCodecTestData<T> : ICodecTestData
@@ -169,6 +179,11 @@ namespace Google.Protobuf
                 }
             }
 
+            public void TestFixedSize()
+            {
+                Assert.AreEqual(name.Contains("Fixed"), codec.FixedSize != 0);
+            }
+
             public override string ToString()
             {
                 return name;