test: set up mutation testing with mutmut - #185
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📝 WalkthroughWalkthroughThe project adds optional mutmut support. It defines dependencies and test configuration, documents mutation-testing workflows, and ignores the generated ChangesMutation testing
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The PR adds mutation-testing configuration and usage guidance, but copied input files may leave stale mutation results and the documented inspection command is not shell-safe. These bounded issues should be corrected before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@CONTRIBUTING.md`:
- Line 59: Update the mutmut show command example in the documentation to
replace the angle-bracket placeholder with the shell-safe MUTANT_NAME
placeholder or a concrete mutant ID.
In `@pyproject.toml`:
- Around line 48-65: Add a cache_invalidation_files setting to the [tool.mutmut]
configuration, including file-matching globs for scripts/**/* and
.github/ISSUE_TEMPLATE/**/* so changes to copied inputs invalidate mutation
results; retain the existing also_copy entries and on_dependency_change
behavior.
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also_copy only copies files, so a change to README.md or a script left a cached mutation run in place: mutmut drops Markdown as documentation noise, and its git detector skips .py files on the assumption that the per-function source hashes cover them, which they only do inside source_paths. Register those inputs explicitly so on_dependency_change actually fires, and use one-level globs because mutmut also matches these patterns with fnmatch, where "scripts/**/*" matches nothing. Also drop the angle brackets from the mutmut show example, which made the copy-pasted block a Bash syntax error.
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Sets up configuration for mutation testing and updates the contributing docs.
Summary by CodeRabbit
Documentation
Chores
mutmut3.x dependency.