def test_circuitbreaker_should_clear_last_exception_on_success_call():
cb = CircuitBreaker(name='Foobar')
cb._last_failure = IOError()
assert isinstance(cb.last_failure, IOError)
cb.call(lambda: True)
assert cb.last_failure is None
def test_circuitbreaker_error__str__():
cb = CircuitBreaker(name='Foobar')
cb._last_failure = Exception()
error = CircuitBreakerError(cb)
assert str(error).startswith('Circuit "Foobar" OPEN until ')
assert str(error).endswith(
'(0 failures, 30 sec remaining) (last_failure: Exception())')