Make the hypothesis plugin check laws from user-defined interfaces too#2060
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sobolevn merged 6 commits intodry-python:masterfrom Mar 9, 2025
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When running property tests for an container, we register it as the strategy for each ancestor interface with laws. However, we do that only for modules in `returns.`, which means that lawful interfaces written by users will not be resolved. This commit just demonstrates the current state.
Right now, it just gets all MRO classes, and it misses interfaces defined outside `returns`. Will tackle that in the next commit.
Earlier, we were restricting it to any class within `returns`. Main user-visible change: We now include `Lawful` ancestors outside `returns`.
We check that the interface class actually has laws. This should eliminate any false positives that come from patching interfaces that were defined outside `returns`. Added a `_ParentWrapper` to test that it doesn't show up. (It did before the change in this commit.) Add to CHANGELOG and the hypothesis plugins page.
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Thanks! Just one minor suggestion.
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I have made things!
Thanks for the thoughtful and convenient plugin for running interface laws.
I found, however, that the plugin was not running the laws for an interface I defined myself. So, I decided to add that behavior.
Main changes:
returnsmodule. This is the user-visible change.hypothesisplugin, for each property test, we patch the interface with the container strategy:Checklist
CHANGELOG.mdRelated issues