The Acceptance‑Test Library for Microfeatures: 24 Ready‑to‑Paste Tests (Playwright + Manual Checks)

Microfeatures (small product changes, paid or free) often fail the same four categories: behavior mismatch, billing mistakes, incomplete rollback plans, and missing telemetry. A concise, standard set of acceptance checks prevents the common, costly cycles where contractors deliver "done" but product owners still see regressions in production.

Design the acceptance set to be practical: most items must be automatable with Playwright for deterministic UI and end‑to‑end checks, while a few must stay manual because they require human judgment (legal copy, visual design nuances, or CX verification). This hybrid reduces manual QA time while keeping sign‑off credible and explainable.

Integrate the Playwright snippets into your feature branch CI so the primary behavior checks run automatically. Require a short test report: passing CI, screenshots/traces for any failures, and a 1‑sentence rollback plan for every failing assertion. This is how teams avoid accepting tests that only pass locally.

For manual checks, use a one‑page pass/fail rubric that lists each manual item with an optional evidence field (screenshot or short video). Accept delivery only when all automated assertions pass and manual items are either pass or documented with a remediation plan.

Below are 24 ready‑to‑paste Playwright snippets and paired manual checks. Each Playwright snippet is intentionally minimal: stable locators (getByRole/getByText/data-testid), explicit preconditions (feature flag, fixture setup), and a single primary assertion. For flaky systems (feature flag SDKs or streaming flags), prefer initializing flags via storage/cookie or mocking the flag API in the test environment.

For billing checks, include API‑level verification (webhook events, entitlement state) in addition to UI assertions. Billing failures are particularly dangerous; always require at least one reproducible webhook or API assertion for any purchase path.

Behavior (8 tests — Playwright first): 1) Happy path CTA flow — assert final success message and created resource ID in API. Playwright: navigate, click CTA, expect success text; fetch API to confirm object exists. Manual: review success copy and link behavior. 2) Access control — test role that should not see the microfeature. Playwright: set auth fixture to limited role; assert element not visible. Manual: try via browser impersonation / support account. 3) Edge input validation — send malformed input and assert specific validation error. Manual: confirm error copy is actionable. 4) Feature‑flag OFF — confirm feature hidden. Playwright: seed flag off and assert absence. Manual: toggle flag via admin UI and confirm the user experience. 5) Lazy load / performance smoke — measure that feature load adds <X ms median (baseline). Playwright: measure timings; attach trace. Manual: verify spinner/placeholder behavior. 6) State continuity — save, navigate away, return — assert persisted state. Manual: verify UX expectations for partial progress. 7) Cross‑browser visual sanity — Playwright: screenshot diffs for Chromium & WebKit. Manual: eyeball key breakpoints. 8) Accessibility quick scan — Playwright: test role presence and tab order; Manual: run a screen reader and verify key content is read.

Billing (6 tests — mix of automated and API checks): 9) Buy happy path — Playwright simulates purchase UI; webhook mock asserts 'charge succeeded' event and entitlement granted. Manual: check customer email and invoice copy. 10) Trial start & conversion — assert trial flags and entitlement toggles after conversion webhook. Manual: confirm trial messaging and trial end date copy. 11) Proration change — change plan mid‑period and assert invoice line items or prorated amount via API. Manual: verify displayed price and prorate copy. 12) Failed payment handling — simulate gateway decline and assert UI error + account downgraded behavior via webhook. Manual: verify user messaging and retry CTA. 13) Refund / chargeback flow — simulate refund webhook and verify entitlement revoked and accounting note created. Manual: check support portal entry and customer notification. 14) Delayed webhook / out‑of‑order events — replay webhooks out of order and assert system is idempotent (no duplicate entitlements). Manual: check audit trail for single change.

Rollback & safety (6 tests): 15) Quick rollback toggle — enable feature, then flip rollback flag and confirm immediate hide without data loss. Manual: confirm no orphaned resources or broken navigation. 16) Partial deploy safety — verify feature works for canary tenant only (tenant targeting). Manual: confirm non‑canary tenants unaffected. 17) Data migration sanity — migration step idempotency check via test fixture; assert no duplicate rows. Manual: inspect sample migrated records for correctness. 18) Emergency kill switch — simulate monitoring alert then invoke kill endpoint and confirm feature is off and alert routing shows the invocation. Manual: confirm on‑call runbook executed. 19) Backfill/compensation job — run compensation job on small dataset and assert consistent state. Manual: inspect job logs and sample records. 20) Rollback DRY run — simulate rollback in staging and assert no production DB writes would be applied (dry run). Manual: audit dry run report.

Telemetry & observability (4 tests): 21) Event emission — perform action and assert telemetry event sent with required fields (user_id, feature_version, correlation_id). Manual: verify event appears in analytics UI or raw event log. 22) Error rate spike detection — inject a controlled error and confirm alert fires to the configured channel within threshold. Manual: confirm alert contains deployment metadata. 23) Trace continuity — perform multi‑service flow and assert distributed trace contains all spans and the correlation ID. Manual: inspect traces to ensure sample contains needed metadata. 24) Telemetry loss detection — simulate telemetry backend delay and assert graceful degradation and local buffering. Manual: confirm retry behavior and backlog drain.

Make every automated test assert one thing and bake stable preconditions into fixtures — authenticated user, seeded data, and deterministic feature flag state. Use getByRole, getByText, or data‑testids rather than brittle CSS selectors to avoid maintenance churn.

Treat telemetry and billing tests as first‑class citizens. Wire webhook mocks and API assertions into the test harness so that you detect backend mismatches early. Require rollout evidence: a Playwright trace, a webhook payload screenshot, or an analytics event reference. Finally, always require a rollback plan as part of acceptance — if the change cannot be reversed quickly, don't ship it.