Acceptance‑Test Library for Microfeatures: 20 Ready‑to‑Drop Playwright Snippets + Manual Checks

Treat each test as dual evidence: an automated Playwright snippet that runs in CI and a one-line manual check used for demo and handoff. The Playwright tests prove deterministic behavior; the manual checks validate business intent, billing signals, and edge cases that are easiest to confirm by a human during a demo.

Keep the suite small and environment‑aware. Run these snippets against a staging or install-less demo URL (not production). Use feature flags or canary percentages for staged release and map each acceptance test to the exact canary percentage and monitoring window you’ll use during rollout.

Group tests into five categories so they’re easy to scan in a PR: Core flow (3), Access & Entitlement (4), Billing & Metrics (4), Failure & Rollback (5), and Demo UX & Activation (4). For each category below you’ll find what to automate in Playwright and the short manual check you should run before marking a delivery as demoable.

The goal is not 100% coverage — it’s confidence that the microfeature will demonstrate the promised behavior, charge (or not) correctly, and fail safely. Each Playwright snippet should be a tiny test file that focuses only on the scenario described and uses a stable selector or data attribute.

Use three patterns consistently: (1) Setup — create test user and seed minimal data via API, (2) UI assertion — navigate to the demo URL and assert the visible outcome via data-test selectors, and (3) Telemetry/billing assertion — intercept network or call a test-only endpoint to assert the correct event was emitted. Keep each test isolated and idempotent.

A single example pattern you can reuse across tests: create the test user via API, visit the feature URL, perform the interaction, assert the UI change, and assert a telemetry POST was received. If your product uses feature flags, include a small helper to enable the flag for the test account before visiting the UI.

Automated tests catch regressions; manual checks confirm the product does what a paying customer expects. Each manual check should include required accounts, test data, and success evidence (screenshot, invoice ID, or a 60-second demo clip). For billing-related checks, insist on verifying both the customer-facing receipt and the backend metric (billing counter or revenue event).

Operational handoff should include the one‑page spec, the acceptance tests mapped to PRs, rollback instructions, and the owner for the first 72 hours after release. If the microfeature touches payments or third‑party integrations, document the kill switch and who can flip it.