@then(u'it should fail because "{reason}"')
def then_it_should_fail_because(context, reason):
 assert False, ('FAILED: %s' % reason)

@ then ( u'it should fail because "{reason}"' ) def then_it_should_fail_because ( context , reason ) : assert False , ( 'FAILED: %s' % reason )
self documenting step that indicates why this step should fail .