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fix: mutants in package main are tested, not reported as survived #165

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Merged
ExtraToast merged 1 commit into from
Oct 16, 2026
Merged

fix: mutants in package main are tested, not reported as survived #165

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4 changes: 3 additions & 1 deletion .github/workflows/mutation-report.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -63,7 +63,9 @@ jobs:
bin=$(go env GOBIN)
# gremlins reads the module root as `.`; given `./...` it finds no mutants at all. Each
# mutant reruns the tests, and the default timeout times out a race-enabled suite.
"${bin:-$(go env GOPATH)/bin}/gremlins" unleash --diff "$BASE" --timeout-coefficient 40 \
# --integration runs every test per mutant: otherwise gremlins tests the directory named
# after the Go package, so a mutant in `package main` runs no tests and reads as survived.
"${bin:-$(go env GOPATH)/bin}/gremlins" unleash --integration --diff "$BASE" --timeout-coefficient 40 \
--output "$RUNNER_TEMP/gremlins.json" .

- name: Mutate the changed TypeScript
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9 changes: 9 additions & 0 deletions tests/test_mutation_report.py
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Expand Up @@ -130,3 +130,12 @@ def test_a_report_that_is_not_json_is_named_but_does_not_fail(self) -> None:

if __name__ == "__main__":
unittest.main()


class TheWorkflow(unittest.TestCase):
def test_gremlins_runs_every_test_against_each_mutant(self) -> None:
# gremlins otherwise picks the package to test by finding a directory named after the Go
# package, so a mutant in `package main` under cmd/app runs no tests and reads as survived.
workflow = (Path(__file__).resolve().parents[1] / ".github/workflows/mutation-report.yml").read_text()
unleash = next(line for line in workflow.splitlines() if "gremlins\" unleash" in line)
self.assertIn("--integration", unleash)
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