NUnit Unit Test has "ExpectedException" but still failing on exception

Is the expected message correct? Is that the exact same message that CustomReference.Parse(string) throws? For example, it is not what is being displayed in the NUnit console.

I wouldn't know another reason why this would not work. What version of NUnit are you using?

What happens if you do this?

[TestFixture] public class CustomReferenceTests { [Test] [ExpectedException(typeof(ArgumentException))] public void TestParsingCustomReferenceWithInValidSecondsFromMidnight() { // I am expecting this method to throw an ArgumentException: CustomReference.Parse("010100712386401000000012"); } [Test] [ExpectedException(typeof(ArgumentException), ExpectedMessage = "Seconds from midnight cannot be more than 86400 in 010100712386401000000012")] public void TestParsingCustomReferenceWithInValidSecondsFromMidnightWithExpectedMessage() { // I am expecting this method to throw an ArgumentException: CustomReference.Parse("010100712386401000000012"); } } public class CustomReference { public static void Parse(string s) { throw new ArgumentException("Seconds from midnight cannot be more than 86400 in 010100712386401000000012"); } }