'Setting subdir to nonexistent directory should raise an error.'

def test_missingdir(self):

    try:
        self.auth.load_creds(subdir='/nosuchdir')
    except OSError:
        pass
    except ValueError:
        pass
    except Exception as e:
        self.fail(('Unexpected    exception    thrown:    %s' % e))
    else:
        self.fail('OSError    exception    not    thrown.')
