Systematic 14-point checklist for reviewing E2E test quality across Playwright, Cypress, and Puppeteer. Three-phase review: automated grep, LLM analysis, coverage gap analysis. P0/P1/P2 severity classification. Tier 1 catches high-impact bugs: error swallowing, boolean traps, raw DOM queries, conditional bypass. Tier 2 covers quality improvements: duplicates, hard-coded timeouts, flaky patterns, YAGNI in Page Objects.
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