'Sampling returns reason when get_probe fails.'

@capture_logging(None)
def test_failed_get_probe(self, logger):

    sampled = sample(BrokenGetProbeOperation(), FakeMetric(repeat(5)), 1)
    result = self.successResultOf(sampled)
    self.assertFalse(result['success'])
    self.assertIn('get_probe    failed', result['reason'])
