Define expected behavior and use tests to guide implementation and changes.
Full test-first discipline, anchored to how this codebase actually runs its tests — that command belongs to the project's own docs and build configuration. Then red-green-refactor: watch the new test fail because the capability genuinely doesn't exist yet, write the minimum that turns it green, reshape only while everything stays green. Skipping the 'watch it fail' step licenses a test that never proved anything to pretend it guards behavior.
Good tests meet executable standards: the name says what breaks, tests exercise the real thing rather than polite stand-ins, tests ship in the same batch as the implementation. Add the mutation check — deliberately break one line of the code; if the whole suite still passes, those tests were guarding air. Common fake-test signals (mirror-image structure, coverage padding, assertions on internals) come with a comparison list.
Commands run with the project's real entrypoints in the task's authorized environment, and 'should pass' is never a result. Built for landing new features, nailing defect fixes, and every 'prove it before merge' setting.
Examples describe the request and the shape of the expected deliverable; they are not completed run results.
Add 'export filename carries the date': write one failing test against the repo's real test command, show me its failing output, then the minimal implementation.
Honest red-then-green run records and a minimal change set, suite staying green.
Give this 200-case green suite a mutation check: deliberately break five things in the implementation, see which assertions never react, then a hardening list.
A per-mutation table: assertions that caught the break, ones that slept, and the tests needing hardening.
iOS · Android
iOS
Android
MIT
MIT (root LICENSE)
The pinned skill subtree and shipped references were audited; full applicable license and per-file adaptation/asset notes are preserved under references/licenses/ and references/PROVENANCE.md.
Publication commit 25e07dbeeb, audited source 84c524b6fb; catalog digest iOS 46196ba57ed7… · Android 16de89d019e2….
Version records ship with the signed catalog; the target and released versions are shown below.
