如何模拟with语句中使用的打开(使用Python中的Mock框架)? [英] How do I mock an open used in a with statement (using the Mock framework in Python)?
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问题描述
如何使用模拟测试以下代码(使用模拟,补丁装饰器和 Michael Foord的Mock框架):
How do I test the following code with mocks (using mocks, the patch decorator and sentinels provided by Michael Foord's Mock framework):
def testme(filepath):
with open(filepath, 'r') as f:
return f.read()
推荐答案
此方法已在模拟0.7.0中更改,该模拟最终支持模拟python协议方法(魔术方法),尤其是使用MagicMock:
The way to do this has changed in mock 0.7.0 which finally supports mocking the python protocol methods (magic methods), particularly using the MagicMock:
http://www.voidspace.org.uk/python/mock/magicmock.html
作为上下文管理器打开的模拟示例(来自模拟文档的示例页面):
An example of mocking open as a context manager (from the examples page in the mock documentation):
>>> open_name = '%s.open' % __name__
>>> with patch(open_name, create=True) as mock_open:
... mock_open.return_value = MagicMock(spec=file)
...
... with open('/some/path', 'w') as f:
... f.write('something')
...
<mock.Mock object at 0x...>
>>> file_handle = mock_open.return_value.__enter__.return_value
>>> file_handle.write.assert_called_with('something')
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