def METHOD_NAME(self):
    """
    L{_ErrorFormatter.formatError} should use L{os.strerror} to format
    error messages if it is constructed with only an error tab which does
    not contain the error code it is called with.
    """
    error = 1
    # Sanity check
    self.assertNotEqual(self.probeErrorCode, error)
    formatter = _ErrorFormatter(None, None, {error: "wrong message"})
    message = formatter.formatError(self.probeErrorCode)
    self.assertEqual(message, os.strerror(self.probeErrorCode))