increase test coverage
diff --git a/csharp/src/Google.Protobuf.Test/MessageParsingHelpers.cs b/csharp/src/Google.Protobuf.Test/MessageParsingHelpers.cs
index b2418ee..5ed6091 100644
--- a/csharp/src/Google.Protobuf.Test/MessageParsingHelpers.cs
+++ b/csharp/src/Google.Protobuf.Test/MessageParsingHelpers.cs
@@ -108,12 +108,18 @@
// serialize using CodedOutputStream
var bytes = message.ToByteArray();
- // also serialize using IBufferWriter and check it leads to the same data
+ int messageSize = message.CalculateSize();
+ Assert.AreEqual(message.CalculateSize(), bytes.Length);
+
+ // serialize using IBufferWriter and check it leads to the same output
var bufferWriter = new ArrayBufferWriter<byte>();
message.WriteTo(bufferWriter);
- Assert.AreEqual(bytes, bufferWriter.WrittenSpan.ToArray(), "Both serialization approaches need to result in the same data.");
+ Assert.AreEqual(bytes, bufferWriter.WrittenSpan.ToArray());
- Assert.AreEqual(message.CalculateSize(), bytes.Length);
+ // serialize into a single span and check it leads to the same output
+ var singleSpan = new Span<byte>(new byte[messageSize]);
+ message.WriteTo(singleSpan);
+ Assert.AreEqual(bytes, singleSpan.ToArray());
// TODO: also test different chunk sizes for IBufferWriter
}
