Testing expected exceptions with NUnit

Question

I have a class (call it filetest) in a class library (b), which is trying to get files from a directory which does not exist. This throws an exception fine, and there is a throw in the catch block.

Above in the callstack in a class called Test (excuse the names as this si a test), there I call the class filetest and the method which reads the wrong directory, and try to catch the exception.

I have an NUnit test which calls the class/method responsible for invking filetest and the method which reads the wrong directory. I have an expectedexception attribute, set to DirectoryNotFoundException, but the test fails saying "UnsupportException thrown". Am I wrong to expect an exception in the method in Test?

Thanks

Please show the code. It looks as if you are not throwing a DirectoryNotFoundException but something else. — Daniel Hilgarth
I agree with Daniel Hilgarth. It would be really helpful if you could include the code - specifically the part from your try/catch block where the exception is rethrown. — Richard J Foster

Unknown Unknown · Accepted Answer · 2013-12-06T01:29:51

. Am I wrong to expect an exception in the method in Test?

Yes, for the following reasons:

The assumption is false
There may be multiple exceptions for a single test

Testing expected exceptions with NUnit

1 Answers