Molar · Engineering blog

Ship fast.
Break nothing.

Practical engineering guides from the Molar team — AI-generated Playwright suites, deterministic testing against cloned services, and merge gates that actually hold.

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Flaky tests: root causes and durable fixes Timing races, shared state, drifting environments — and the fix for each. Reliability Self-healing test automation, done right Locator re-ranking with approval gates — never silent rewrites. Maintenance E2E best practices that survive scale Critical path first, user-visible selectors, deterministic data. Fundamentals Playwright in GitHub Actions Caching, sharding, traces, and required checks that hold. CI/CD Required status checks: practical merge gates Branch protection that blocks broken merges — with escape hatches. CI/CD Synthetic monitoring beyond uptime pings Flow-level checks every few minutes catch what pings can't. Production Testing Twilio SMS + OTP flows safely Deterministic codes from stateful clones — no carriers in CI. Clones Email workflow testing: OTPs & invites Assert arrival, links, and codes — no SMTP, no real inboxes. Clones API mocking vs stateful service clones Mocks stub responses; clones run real vendor semantics. Clones Regression strategies for fast-moving teams Risk-based selection, PR gates, insurance runs that work. Fundamentals Testing third-party APIs safely Stripe, SendGrid, S3 — real semantics, zero blast radius. Clones Continuous testing in your pipeline What to run at commit, PR, deploy, and production. CI/CD Staging environments are lying to you Drift and dirty data — what to run against instead. Environments Test Stripe checkout without charging a card Stateful Stripe clones for E2E and production guard. QA engineering AI agents and the future of testing Agents write half the code. Who verifies it? Opinion Shift-left testing, explained Catch bugs where they're cheapest — design and PR time. Fundamentals Playwright vs Cypress in 2026 Architecture, debugging, scale — an honest comparison. Comparisons Startup QA without a QA team Automate the money paths before you can hire QA. Startups Test data management best practices Deterministic IDs and synthetic identities kill interference. Fundamentals Visual regression testing: pragmatic guide Diffs without noise — semantic assertions come first. Fundamentals

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