ci: restore the mutation run and kill the survivors 2.8.0 left - #212
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`tests/test_readme.py` reads README.md and docs/ from the repository root, but mutmut runs pytest from its `mutants/` copy, which holds the package and the tests and nothing else. Collection raised FileNotFoundError there, so every scheduled run since it landed failed before a single mutant ran. The file imports no library code and could not kill a mutant anyway, so it joins the exclusions rather than learning where it is being run from.
With collection fixed the run surfaced 32 survivors against a budget of 23. Nine came in with #194 and #195 and every one of them is a missing assertion, not an equivalent mutant: - the refusal messages of `validate_unreachable_exceptions` and `validate_backoff_support` were matched on a fragment, so six mutations of the wording and one of the reported type went unnoticed. The backoff refusal is now asserted whole: it names the two ways out, and a caller who hits it has nothing else to go on. - `_settle` could have combined its unreachable test with `or` and no test would have failed. A breaker with `unreachable_exceptions` configured would then read an ordinary probe failure as inconclusive and sit in HALF_OPEN while the dependency kept failing. - `_close` could have left `_failed_rounds` at `None`. The backoff reset was only checked as far as the next wait being the base one, which `None` also produces; the round after it is where the counter has to be an integer. Local run: 614 of 637 killed, and the 23 survivors are exactly the five equivalent classes CONTRIBUTING.md enumerates. Its baseline is updated.
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WalkthroughThe pull request updates mutation-test exclusions and baseline documentation. It strengthens error-message assertions and adds regression coverage for HALF_OPEN probe handling and backoff reset behavior. ChangesMutation testing and regression coverage
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Other Merge Risk: 🔵 Low · up to The new regression tests can still pass when complete error messages change unexpectedly. Anchor both patterns to fully protect the stated message contracts. 🚥 Pre-merge checks | ✅ 8 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (8 passed)
Full details: Changelog EntryExplanation The PR changes ✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Actionable comments posted: 1
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Inline comments:
In `@tests/test_coordination.py`:
- Line 1512: Anchor both pytest exception-message assertions with regex start
and end boundaries so they require an exact full-message match. Update the
ValueError assertion using the refusal value and update the assertion in the
engine test for the complete unreachable_exceptions message, preserving the
existing exception types and expected text.
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CONTRIBUTING.mdpyproject.tomltests/test_coordination.pytests/test_engine.pytests/test_state_machine.py
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- GitHub Check: Mutation score
- GitHub Check: Platform smoke (macos-latest, Python 3.14)
- GitHub Check: quality (3.14t)
- GitHub Check: Platform smoke (windows-latest, Python 3.11)
⚠️ CI failures not shown inline (2)
GitHub Actions: Code scanning AI findings on PR #212 / 0_github-advanced-security.txt: Code scanning AI findings on PR #212
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mecho "RUNNER_TEMP=$RUNNER_TEMP"�[0m
�[36;1mfind "$RUNNER_TEMP" -maxdepth 1 -type f -name 'git-credentials-*.config' -print -delete�[0m
�[36;1m�[0m
�[36;1m# Generate a unique token and stop processing workflow commands to prevent the runtime from injecting commands�[0m
�[36;1mSTOP_***REDACTED_SECRET_ASSIGNMENT*** /proc/sys/kernel/random/uuid)�[0m
�[36;1m�[0m
�[36;1m# Use a trap to ensure we always resume command processing and check for�[0m
�[36;1m# fallback error annotations, even if the runtime exits with a non-zero code�[0m
�[36;1m# (which would otherwise cause set -e to abort the shell before we get here).�[0m
�[36;1m# The trap preserves the original exit code.�[0m
�[36;1mcopilot_cleanup() {�[0m
�[36;1m �[0m
�[36;1m if [ -n "${GIT_PROXY_PID:-}" ] && kill -0 "$GIT_PROXY_PID" 2>/dev/null; then�[0m
�[36;1m echo "Stopping git-proxy (pid=$GIT_PROXY_PID)..."�[0m
�[36;1m kill "$GIT_PROXY_PID" 2>/dev/null || true�[0m
�[36;1m for _ in {1..25}; do�[0m
�[36;1m if ! kill -0 "$GIT_PROXY_PID" 2>/dev/null; then break; fi�[0m
�[36;1m sleep 0.2�[0m
�[36;1m done�[0m
�[36;1m if kill -0 "$GIT_PROXY_PID" 2>/dev/null; then�[0m
�[36;1m echo "git-proxy did not stop gracefully; forcing termination."�[0m
�[36;1m kill -KILL "$GIT_PROXY_PID" 2>/dev/null || true�[0m
�[36;1m fi�[0m
�[36;1m wait "$GIT_PROXY_PID" 2>/dev/null || true�[0m
�[36;1m fi�[0m
�[36;1m �[0m
�[36;1m echo "::$STOP_***REDACTED_SECRET_ASSIGNMENT***
�[36;1m FALLBACK_FILE="${RUNNER_TEMP}/copilot-fallback-error.txt"�[0m
�[36;1m if [ -f "$FALLBACK_FILE" ]; then�[0m
�[36;1m FALLBACK_MSG=$(head -c 500 "$FALLBACK_FILE" | tr -d '\n\r')�[0m
�[36;1m echo "::error title=Copilot Error::${FALLBACK_MSG}"�[0m
GitHub Actions: Code scanning AI findings on PR #212 / github-advanced-security: Code scanning AI findings on PR #212
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mecho "RUNNER_TEMP=$RUNNER_TEMP"�[0m
�[36;1mfind "$RUNNER_TEMP" -maxdepth 1 -type f -name 'git-credentials-*.config' -print -delete�[0m
�[36;1m�[0m
�[36;1m# Generate a unique token and stop processing workflow commands to prevent the runtime from injecting commands�[0m
�[36;1mSTOP_***REDACTED_SECRET_ASSIGNMENT*** /proc/sys/kernel/random/uuid)�[0m
�[36;1m�[0m
�[36;1m# Use a trap to ensure we always resume command processing and check for�[0m
�[36;1m# fallback error annotations, even if the runtime exits with a non-zero code�[0m
�[36;1m# (which would otherwise cause set -e to abort the shell before we get here).�[0m
�[36;1m# The trap preserves the original exit code.�[0m
�[36;1mcopilot_cleanup() {�[0m
�[36;1m �[0m
�[36;1m if [ -n "${GIT_PROXY_PID:-}" ] && kill -0 "$GIT_PROXY_PID" 2>/dev/null; then�[0m
�[36;1m echo "Stopping git-proxy (pid=$GIT_PROXY_PID)..."�[0m
�[36;1m kill "$GIT_PROXY_PID" 2>/dev/null || true�[0m
�[36;1m for _ in {1..25}; do�[0m
�[36;1m if ! kill -0 "$GIT_PROXY_PID" 2>/dev/null; then break; fi�[0m
�[36;1m sleep 0.2�[0m
�[36;1m done�[0m
�[36;1m if kill -0 "$GIT_PROXY_PID" 2>/dev/null; then�[0m
�[36;1m echo "git-proxy did not stop gracefully; forcing termination."�[0m
�[36;1m kill -KILL "$GIT_PROXY_PID" 2>/dev/null || true�[0m
�[36;1m fi�[0m
�[36;1m wait "$GIT_PROXY_PID" 2>/dev/null || true�[0m
�[36;1m fi�[0m
�[36;1m �[0m
�[36;1m echo "::$STOP_***REDACTED_SECRET_ASSIGNMENT***
�[36;1m FALLBACK_FILE="${RUNNER_TEMP}/copilot-fallback-error.txt"�[0m
�[36;1m if [ -f "$FALLBACK_FILE" ]; then�[0m
�[36;1m FALLBACK_MSG=$(head -c 500 "$FALLBACK_FILE" | tr -d '\n\r')�[0m
�[36;1m echo "::error title=Copilot Error::${FALLBACK_MSG}"�[0m
🧰 Additional context used
📓 Path-based instructions (6)
The core must stay dependency-free: new runtime dependencies belong in `[project.optional-dependencies]` only.
⚙️ CodeRabbit configuration file
Files:
pyproject.toml
pytest functions only, never test classes.
⚙️ CodeRabbit configuration file
Files:
tests/test_engine.pytests/test_coordination.pytests/test_state_machine.py
Keep the core zero-dependency: files under `interlock/` outside `interlock/integrations/` may import only the standard library or other `interlock` modules; `[project] dependencies` in `pyproject.toml` must remain empty; and `interlock/__in...
📄 CodeRabbit inference engine (Custom checks)
Files:
pyproject.toml
Use pytest functions rather than test classes, with names formatted as `test__unit_of_work__state_under_test__expected_behavior`.
📄 CodeRabbit inference engine (AGENTS.md)
Files:
tests/test_engine.pytests/test_coordination.pytests/test_state_machine.py
Support Python 3.11 and newer; use Python 3.11+ features where required.
📄 CodeRabbit inference engine (AGENTS.md)
Files:
tests/test_engine.pytests/test_coordination.pytests/test_state_machine.py
Document user-facing changes in English Markdown documentation and keep generated documentation mirrors synchronized.
📄 CodeRabbit inference engine (AGENTS.md)
Files:
CONTRIBUTING.md
🔇 Additional comments (3)
pyproject.toml (1)
248-248: LGTM!Also applies to: 255-258, 261-261
CONTRIBUTING.md (1)
140-140: LGTM!tests/test_state_machine.py (1)
726-729: LGTM!
`pytest.raises(match=...)` searches, so both tests passed on a message that merely contained the expected one. The point of asserting a whole message is that it is the whole message, so `\A` and `\Z` say so.
The rule exempts the paths that never reach the published package — .github/, planning/, benchmarks/, developer tooling — and CONTRIBUTING.md is one of those, so updating the mutation baseline asked for a changelog entry no user could read. The exemption only applies when a PR touches nothing but these paths, so a behaviour change shipped alongside it still needs one.
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Summary
The weekly
Mutation scorejob has failed since 24 August, and there were twofaults stacked on top of each other.
Collection.
tests/test_readme.pyreadsREADME.mdanddocs/from therepository root, while mutmut runs pytest from its
mutants/copy, which holdsthe package and the tests and nothing else. Every run died on
FileNotFoundErrorbefore a mutant was tested. The file imports no librarycode and could not kill a mutant, so it joins the exclusions.
Budget. With collection fixed the run showed 32 survivors against
SURVIVOR_BUDGET: 23. Nine arrived with #194 and #195, and each is a missingassertion:
validate_unreachable_exceptions, the reported typematch='must be a tuple'never looked at thegot: ...half, so the message could reportNoneTypefor every inputvalidate_backoff_support, six wording mutations_settle:and isinstance(...)→or isinstance(...)unreachable_exceptionsconfigured would read an ordinary probe failure as inconclusive, then sit in HALF_OPEN while the dependency kept failing_close:_failed_rounds = 0→NoneNonealso produces; the round after it is where the counter has to be an integerLocal run afterwards: 614 of 637 killed (96.4%), and the 23 survivors are
exactly the five equivalent classes
CONTRIBUTING.mdenumerates. Its baseline(526 of 549) is updated to match.
SURVIVOR_BUDGETstays at 23.No behaviour changes, so no
docs/page and noCHANGELOG.mdentry: theproduction code is untouched.
Checklist
uv run ruff format --checkanduv run ruff checkpassuv run mypy,uv run pyrightanduv run pyrefly checkpassdocs/) for user-facing changes — n/a, tests and the mutation config onlyCHANGELOG.md[Unreleased]updated — n/a, nothing user-facingRelated issues
Follow-up to #194 and #195.
Fixed
tests/test_readme.pyfrom mutmut runs.Changed