Store test-suite temporary files in temporary directories #422
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When writing files as part of test cases, write them to a temporary directory (created in setUpClass and destroyed in tearDownClass) rather than writing them to the current working directory. This allows running tests without modifying the working tree, which means multiple test processes can run simultaneously from the same working tree (e.g., using pytest-xdist).
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Looks great. tempfile is new to me. Good to know! |
tompollard
approved these changes
Sep 20, 2022
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When writing files as part of test cases, write them to a temporary
directory (created in setUpClass and destroyed in tearDownClass)
rather than writing them to the current working directory.
This allows running tests without modifying the working tree. It
enables running tests in parallel using
pytest-xdist, which allowsrunning the whole test suite in around 12 seconds rather than 35
seconds.
It's also just cleaner not to dump a lot of temporary files in the
working tree.
It does feel weird to be creating and deleting temporary directories
in class methods, but it seems to work. (The alternative, using
setUp and tearDown, would mean creating a new directory for each
individual test function.)