Mocking-the-builtin-open-used-as-a-context-manager

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b2430ffd5b flexmock mock = flexmock(some_method=lambda: "calculated value") assertEquals("calculated value", ... Mocking the builtin open used as a context manager¶.. TEST_TEXT) with unittest.mock.patch('builtins.open', m): result ... This failed, presumably because the code doesn't use read, readline, or readlines. The documentation ... If you are not using the file object as a context manager, you could use:.. The main way to use unittest.mock is to patch imports in the module under test using ... def test_using_return_value(self): """Note 'as' in the context manager is ... print is, of course a built-in function in Python, which means we do not ... with mock.patch('worker.open') as mock_open: mock_open.return_value.. patch , patch.object and patch.dict can all be used as context managers. ... 'file-like', so we'll ensure that our response object uses the builtin open() as its spec .. Use monkeypatch.setitem() to patch the dictionary for the test. ... In the context of testing, you do not want your test to depend on the running user. monkeypatch ... Be advised that it is not recommended to patch builtin functions such as open .... The most common way to mock resources is to use a Python decorator ... throw an exception and then use pytest.raises as a context manager around ... Later on I demonstrate how to mock the builtin open function, and in that .... Mock fake object that returns a canned value and has an expectation, i.e. it includes a ... Mocking the builtin open used as a context manager.. The solution is to use mock_open in conjunction with assertRaises ... Next, using patch as a context manager, open can be patched with the new object, .... Thin-wrapper around the mock package for easier use with py.test. ... is intentionally the same as mock.patch's, its use as context manager and .... Mocking never worked the way you'd expect for the built-in open. ... Frankly, they made it possible to use open as a context manager so that you don't have to .... Here mock_open creates and configures a MagicMock that behaves as a file context manager. Note that the StringIO will only be used for the data if open is used as a context manager. If you just configure and use mocks they will work whichever way open is used. This helper function will be built into mock 0.9.. The built-in print function, by default, sends output to sys.stdout. ... To run the test, the unittest.mock.patch() function is used as a context manager to replace the ... to capture I/O from such C extensions, you can do it by opening a temporary file .... ... use it as a context manager, otherwise you might as well use mock.patch directly. ... See Note about usage as context manager in the README for more information. ... I had to change '__main__.open' with 'builtins.open' .. mock_open(mock=None, read_data=None) It works for open called directly or used as a context manager. The mock argument is the mock object to configure. If None (the default) then a MagicMock will be created for you, with the API limited to methods or attributes available on standard file handles.. Mock is very easy to use and is designed for use with unittest. Mock ... Mocking a context manager · Mocking the builtin open used as a context .... Mocking patterns: chained calls, partial mocking and open as context ... about mocking the builtin open when it is used as a context manager.. The unittest.mock library gives a very nice tool for temporarily replacing objects ... a lot ofdifferent ways in which that patchcan be used:it works as acontext manager, ... from unittest.mock import patch, mock_open >>> with patch('builtins.open', .... But when you peek behind the scenes of the underlying Context Manager protocol ... A good way to see this feature used effectively is by looking at examples in the ... Opening files using the with statement is generally recommended because it ... Interfacing Python and C: The CFFI Module – How to use Python's built-in .... Mock is very easy to use and is designed for use with unittest . ... As well as a decorator patch() can be used as a context manager in a with statement: > ... Changed in version 3.5: If you are patching builtins in a module then you don't need ... out the call to open() it is the returned object that is used as a context manager (and .... Unit tests should be used specifically to test a function's logic. ... A reasonable effort needs to be made to mock external resources used in the ... Opening files in Salt is done using salt.utils.files.fopen() . ... In the tests below you will see that MagicMock's patch() method may be used as a context manager or as a decorator.