It seems to be a tool to cache func/args->result pairs and even persist them between testsuite-runs. Which seems like a great idea to speed things up. However I haven’t noticed any mention of automatically detecting a change of a function source code and invalidating corresponding cache entries. That seems to defeat the purpose of running the test suite, because the tested code changes are not going to be reflected.
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Answer
pytest-cache does two things:
offer a mechanism through which other plugins can get/set values via
config.cache.get|set. This is used bypytest-pep8andpytest-flakesfor example to store the mtime of the last check to avoid re-checking files all the time.store test failures so that you can run
--lfto run only the last failures and--ffto run the last failures first, then the rest of the tests.
The functionality is bound to move to the core with pytest-2.7 (not released as of today) or a subsequent release.