Testing

A real-time error monitoring service captures, groups, and alerts on unhandled exceptions and promise rejections in production so issues are discovered before users report them.

Run Stryker mutation testing on critical business logic to verify that your test suite will actually catch real bugs, not just achieve line coverage.

Set and enforce minimum code coverage thresholds to ensure adequate test coverage.

Website works correctly across major browsers (Chrome, Firefox, Safari, Edge).

Use E2E testing frameworks like Playwright or Cypress to test critical user journeys.

Automate accessibility testing with tools like axe-core, jest-axe, or Playwright's accessibility testing.

Test how multiple units of code work together — API routes with their database queries, form submissions with validation, and component trees with their state management.

Consumer-driven contract tests (Pact) define and verify the API contracts between the frontend consumer and backend provider, catching integration mismatches before they reach production.

Verify your application on real mobile devices and browser DevTools device emulation to catch touch interaction issues, viewport bugs, and mobile-specific rendering problems.

Define measurable performance thresholds (bundle size, Lighthouse scores, Core Web Vitals) and fail CI builds automatically when they're exceeded.

Critical functionality has unit tests with good coverage for reliability.

Use mocks strategically to isolate units under test without over-mocking.

Capture screenshots of components and pages, then automatically compare them against approved baselines to detect unintended visual changes before they reach production.