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如何驗證未在python中調用的模擬方法?

[英]How to verify mock method not called in python?

在我的代碼中,我使用assert_any_call()來驗證Django模型過濾器發生的一系列調用,現在,我需要驗證類似assert_not_call(args)的相反情況。

是否有任何斷言語句可以在python中實現?

最簡單的方法是使用Mock.call_args_list

assert call(None, a=1, b="") not in mocked_func.call_args_list, "Called with invalid args."

如果要使用方法,請使用:

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

要使用此類,請將此裝飾器放在測試函數之前:

@unittest.mock.patch("unittest.mock.MagicMock", NotCalledMagicMock)

或使用以下方法進行模擬:

func_b_mock = NotCalledMagicMock()

要使用該方法(其中func_b_mock是例如patch生成的模擬):

func_b_mock.assert_not_called([12], a=4)

當失敗時,它會引發一個AssertionError如:

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

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