[TIP] Why do you use "autouse" fixtures?

[Florian Bruhin]

* Brian Okken <variedthoughts at gmail.com> [2016-07-26 12:14:30 -0700]:
> If you use "autouse" fixtures, I'd like to know why.
> 
> Here are a few examples I can think of:
> 
> * Work that needs done before, between, or after each test run that doesn't
> affect the outcome of the test.
>     * Maybe we have long running suites and we want to update some
> reporting system whenever a test finishes.
> * The system under test has error logs that need to be interrogated.
>     * The tests maybe should check these logs and fail if new errors are
> created. But just in case the test writer forgets, we can check error logs
> and assert if there's something there. This will cause the test to Error.
> Not as strong as a Fail, but better than missing the problem.
> 
> Are there more reasons?

Some other random examples from my testsuite:

- In conftest.py to fail tests on warnings (though I should probably
  switch to pytest-warnings with -Werror)
  https://github.com/The-Compiler/qutebrowser/blob/master/tests/conftest.py#L136-L140

- To monkeypatch something away for all tests in a given module or class
  https://github.com/The-Compiler/qutebrowser/blob/master/tests/unit/utils/test_jinja.py#L33-L51
  https://github.com/The-Compiler/qutebrowser/blob/master/tests/unit/config/test_configtypes.py#L823-L830

- Same, to get deterministic outcomes with randomness involved:
  https://github.com/The-Compiler/qutebrowser/blob/master/tests/unit/browser/webkit/test_mhtml.py#L29-L31

- To save/restore some behaviour the code under test modifies:
  https://github.com/The-Compiler/qutebrowser/blob/master/tests/conftest.py#L136-L140

- To set up something all tests need to work (but don't need to access
  directly):
  https://github.com/The-Compiler/qutebrowser/blob/master/tests/unit/keyinput/test_basekeyparser.py#L174-L176
  https://github.com/The-Compiler/qutebrowser/blob/master/tests/unit/javascript/position_caret/test_position_caret.py#L29-L36

- To do some kind of cleanup after each test (your first example?):
  https://github.com/The-Compiler/qutebrowser/blob/master/tests/unit/misc/test_sessions.py#L54-L57

Florian

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