From: Daniel Berger <djberg96@...>
Date: 2006-11-25T04:49:54+09:00
Subject: Generic way to test for expected SystemCallError

Hi all,

Ruby 1.8.x

I've got a few tests where I'm looking for expected errors.  These are
various system call errors.  The problem is that the exact Errno is
different from platform to platform, so I end up writing stuff like
this:

assert_raises(Errno::EACCES, Errno::ENOTEMPTY){ Dir.unlink('some_dir')
}

This isn't very robust, since a new platform might fail with a
different kind of Errno.  What I would like is a way to have this test
succeed:

assert_raises(SystemCallError){ Dir.unlink('some_dir') }

The problem is that assert_raises looks for a specific error class.  Is
there a way to tell TestUnit to expect any error that's a subclass of
SystemCallError?

Thanks,

Dan

PS - I see from the documentation that assert_raise is deprecated in
1.9.  What's replacing it?