Testing
Recce is a dbt change review tool that answers one question: what did this PR actually change in the data? When you modify a dbt model, your CI runs dbt tests and they pass — but that only tells you the data is valid, not whether it changed. Recce builds the
Testing
Testing real-time event-driven code is one of the more intellectually demanding corners of frontend and Node.js testing. The code is inherently asynchronous, order-dependent, and timing-sensitive. Standard expect(value).toBe(x) assertions are insufficient when the value hasn't arrived yet. This guide covers the
Testing
Micro-frontend teams ship independently. That's the whole point. But independent shipping only works if every team respects the interfaces their code exposes and consumes. Without enforcement, breaking changes slip through: a prop gets renamed, an event payload changes shape, a shared utility gets a new required parameter.
Testing
Real-time features break in ways that feel random. A typing indicator that works perfectly in manual testing flickers in production. A notification arrives out of order under load. A presence update gets lost when two users connect simultaneously. The tests you wrote passed. The bug is real. The problem
Testing
One of Electron's selling points is write-once-run-everywhere. In practice, cross-platform bugs are one of the top sources of Electron app issues: keyboard shortcuts that work on macOS but not Windows, path handling that breaks on Linux, UI that looks fine on Retina displays but
Testing
Component-level accessibility testing is where you prevent accessibility bugs from ever reaching the browser. By testing at the unit and integration level — before a real page renders — you catch missing ARIA attributes, broken focus management, and silent live regions while the component code is right in front of you.
Testing
Cross-browser visual testing is where most visual regression testing practices break down. What works cleanly for a single Chrome environment becomes a noise factory when you add Firefox, Safari, and mobile browsers — each with slightly different font rendering, antialiasing, and CSS implementation details. The solution isn't to
Testing
React and Next.js have become the default stack for building multilingual web apps, with libraries like react-i18next, next-intl, and react-intl handling the heavy lifting. But a common mistake is writing no tests for the i18n layer itself — assuming that if translations load, everything works. This guide
React Native
A comprehensive walkthrough of React Native Testing Library with Jest, covering renderHook for custom hooks, userEvent for realistic interactions, the full query API, async utilities, and accessibility-first testing patterns. React Native Testing Library (RNTL) has matured into the standard way to test React Native components and hooks. Paired with
React Native
Snapshot testing in React Native can catch unintended UI regressions, but done wrong it becomes a rubber-stamp exercise. This post covers when snapshots add value, how to write focused inline snapshots, and patterns that keep your snapshot suite meaningful over time. Snapshot testing is one of the most misused
Coverage.py
Coverage.py measures which Python lines, branches, and functions are executed during tests. Use it with pytest-cov for seamless pytest integration, enforce minimum coverage with --fail-under, and generate XML reports for Codecov, SonarQube, and GitHub Actions integrations. Coverage.py is the standard Python coverage measurement tool. Unlike language-
React Native
Testing navigation in React Native requires mocking React Navigation's hooks and prop injection, verifying that screens navigate correctly in response to user actions, and testing deep links and complex stack flows. This post covers the full range of navigation testing patterns. Navigation is one of the trickiest parts