在我的代码中,我使用assert_any_call()来验证django模型过滤器发生的一系列调用,现在我需要验证它的反向情况,如assert_not_called(args)。
在python中是否有任何断言声明来实现这一点?
答案 0 :(得分:2)
最简单的方法是使用Mock.call_args_list
:
assert call(None, a=1, b="") not in mocked_func.call_args_list, "Called with invalid args."
如果您需要方法,请使用:
class NotCalledMagicMock(unittest.mock.MagicMock):
def assert_not_called(_mock_self, *args, **kwargs):
self = _mock_self
if self.call_args is None:
return
expected = self._call_matcher((args, kwargs))
if any(self._call_matcher(ca) == expected for ca in self.call_args_list):
cause = expected if isinstance(expected, Exception) else None
raise AssertionError(
'%r found in call list' % (self._format_mock_call_signature(args, kwargs),)
) from cause
要使用此类,请将此装饰器放在测试函数之前:
@unittest.mock.patch("unittest.mock.MagicMock", NotCalledMagicMock)
或者使用以下方式制作你的模仿:
func_b_mock = NotCalledMagicMock()
使用该方法(其中func_b_mock
是由patch
生成的模拟):
func_b_mock.assert_not_called([12], a=4)
当它失败时,会引发AssertionError
之类的:
Traceback (most recent call last):
File "your_test.py", line 34, in <module>
test_a()
File "/usr/lib/python3.4/unittest/mock.py", line 1136, in patched
return func(*args, **keywargs)
File "your_test.py", line 33, in test_a
func_b_mock.assert_not_called([1])
File "your_test.py", line 20, in assert_not_called
) from cause
AssertionError: 'func_b([1])' found in call list