Fix broken test
diff --git a/csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs b/csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs
index b0f5874..9e994a6 100644
--- a/csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs
+++ b/csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs
@@ -384,7 +384,7 @@
[Test]
[TestCase(1, 2123456789)]
[TestCase(1, -100000000)]
- public void DurationStandalone_NonNormalized(long seconds, int nanoseconds, string expected)
+ public void DurationStandalone_NonNormalized(long seconds, int nanoseconds)
{
Assert.Throws<InvalidOperationException>(() => new Duration { Seconds = seconds, Nanos = nanoseconds }.ToString());
}