coverage-gaps

# Coverage Gaps Coverage % is a vanity metric. Hunt the gaps that bite: - **Error paths** — the 500, the timeout, the empty/null input, the malformed payload. Almost always untested. - **Boundaries** — 0, 1, max, off-by-one, empty collection. - **Branches** — every `if/else` and `catch` exercised, not just the happy line. - **Concurrency / order** — anything stateful tested in isolation AND in sequence. Skip tests that assert a constructor sets a property — worthless. Test behavior, not implementation. Output: the 3-5 highest-risk untested paths, ranked by blast radius, with the test to add.