Make workflow/test suites “branch-complete and predicate-exact”: every reachable `case` arm and every required gating condition must be exercised and asserted, with environment-correct shims/guards. Apply this standard: 1) **Table-driven mapping tests must include every reachable branch** (don’t rely on bijection checks only over the listed subset). If a `case` arm exists in the implementation, it must appear in the ARMS/fixtures list. 2) **Ensure mocks/fixtures actually enter the new code path.** If the PR adds an `if`/mapping branch, add a test where that branch evaluates true (or explicitly covers each comparison outcome). 3) **Assert the full predicate, not just a prefix.** If the gate is `A && B && C`, your test should check that the produced script/body contains all three conditions (missing one enables false-green). 4) **Add OS/CI guards for end-to-end tests that rely on POSIX behavior or GNU tools.** Use `itOnUnix` or darwin-only shims for `sed -i` and avoid shebang/shim issues on Windows merge-queue. 5) **For timing/loop bugs, construct inputs so the code reaches the failing region** (e.g., ensure a retry loop re-enters after the deadline check). Example patterns: - **Include missing `case` arms in ARMS** ```js const ARMS = [ // ...existing arms... [{ VERDICT: 'infra-error' }, 'infra-error (crash, OOM, or unwritable results)', '基础设施故障（崩溃、OOM 或结果不可写）'], [{ VERDICT: '' }, 'unknown', '未知'], ]; expect(seenZh.size).toBe(ARMS.length); ``` - **Platform guard for POSIX npm shims** ```js const itOnUnix = process.platform === 'win32' ? it.skip : it; itOnUnix('fails on real critical vulnerability', () => { // end-to-end with npm shim }); ``` - **Predicate-exact assertion** ```js // gate must require ASSERT_LINE as well as REPORT expect(publishStep).toMatch(/\[ "\$\{VERDICT:-\}" = 'pass' \] && \[ -n "\$REPORT" \] && \[ -n "\$ASSERT_LINE" \]/); ``` If you follow these rules, regressions like “missing untested arms,” “new branch never executed,” “gate predicate weakened,” and “POSIX-only shims failing on Windows/macOS” are far less likely to slip through CI.