Tom Boucher
55ae8e42d2
test( #2986 ): mutation-killer suite for config-schema.cjs (95 typed assertions) ( #3005 )
...
* test(#2986 ): mutation-killer suite for config-schema.cjs (95 typed assertions)
Stryker measured 4.62% mutation score on config-schema.cjs (6 killed,
124 survived). Surviving mutants documented that existing tests were
exercising paths without verifying outputs.
Adds tests/bug-2986-config-schema-mutation-killers.test.cjs (95 tests,
4 suites) targeting each surviving mutant class:
- M1/M4: parameterized isValidConfigKey(key) === true for every member
of VALID_CONFIG_KEYS. Kills static-key-fast-path mutations
(if (VALID_CONFIG_KEYS.has(...)) return true; -> if (false) return true;)
because no static key matches any DYNAMIC_KEY_PATTERN by design.
- M2: representative dynamic-pattern keys (one per pattern). Each matches
exactly one pattern. Kills .some -> .every mutation: with .every, no
single key matches all patterns -> all dynamic keys would be rejected.
- M3: strictEqual against the literal boolean true/false (not assert.ok
truthy checks). Kills polarity-flip mutations.
- Anchor-tightening: keys that differ from valid by one char beyond the
documented shape (trailing dot-segment, empty agent name, non-enum tier,
etc.). Kills regex-loosening mutations on ^, $, charset boundaries.
Tests assert on typed boolean return values from the lib's public surface.
Zero source-grep, zero raw-text matching.
* chore(#2986 ): add changeset fragment for PR #3005
* test(#2986 ): use dynamic-only rep key for features pattern (CR feedback)
CodeRabbit on PR #3005 : features.thinking_partner is in the static
VALID_CONFIG_KEYS set, so the static fast-path returns true before
DYNAMIC_KEY_PATTERNS.some() is ever called. A Stryker mutant that
removed only the features entry from DYNAMIC_KEY_PATTERNS would
survive because the test only ever exercised the static path for
that key.
Replaced features.thinking_partner with features.some_dynamic_feature
which is NOT in static keys, so isValidConfigKey must reach the
dynamic path to return true. Added a per-rep invariant that asserts
each representative key is NOT a member of VALID_CONFIG_KEYS,
catching this class of mistake at test time on any future
representative-key change.
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