class FastFailingTest(TestCase):
    """
    A TestCase that stops execution of the suite if it fails.
    """

    def run(self, result=None):
        if result is None:
            result = self.defaultTestResult()
        failfast = result.failfast
        result.failfast = True
        super(A_TestRunnerTest, self).run(result)
        result.failfast = failfast