Testing
Storybook started as a UI development tool — a sandbox where you could render components in isolation and iterate on them without spinning up your whole application. That's still what most people use it for. But since Storybook 7, it has grown into a legitimate component testing platform. You
Testing
Jest is fast enough — until it isn't. Once your test suite crosses a few hundred tests, you start feeling it: the five-second startup, the transform overhead, the config file that has evolved into something no one fully understands. Bun's built-in test runner is a direct answer
Testing
Appium is the most widely used framework for mobile app automation. It lets you write tests once and run them on Android and iOS using the same API — whether your app is native, hybrid, or a mobile web app. This tutorial walks you through everything: installing Appium, setting up your
Testing
If you've ever mocked an API by patching fetch, overriding axios.get, or wrestling with nock's obscure intercept API, you know the pain. Your mock and your real network call look nothing alike. The mock breaks when you refactor your fetching logic. And none of it
Testing
GraphQL APIs break most REST testing assumptions. One endpoint, unlimited query shapes, typed schemas, subscriptions — it's a different beast. This guide covers the full testing stack: unit tests for resolvers, integration tests with supertest, Apollo MockedProvider for component testing, schema validation, subscription testing, and E2E automation. What Makes
Testing
Accessibility testing is how you verify your web application works for people using screen readers, keyboard navigation, high-contrast modes, and other assistive technologies. It is also how you avoid lawsuits. This guide covers the full stack: automated axe-core checks, Playwright accessibility audits, jest-axe for unit tests, keyboard navigation testing, screen
Testing
A defect found in design costs $1 to fix. The same defect found in production costs $100. That ratio — documented by IBM's Systems Sciences Institute and replicated across dozens of subsequent studies — is the entire case for shift left testing. Shift left testing moves quality verification earlier in
Testing
Feature flags are one of the most powerful tools in modern software deployment. They're also one of the most underestimated sources of bugs. When you add a feature flag, you don't just add a feature — you add a new dimension of application state. Every flag doubles
Testing
Amazon Kiro is the most interesting AI IDE to launch since Cursor — and it has a genuinely different approach to code generation that changes how testing needs to work. Where Cursor and Cline take a prompt-and-iterate approach, Kiro is spec-driven: you describe a feature in plain English, it generates structured
Testing
Your unit tests pass. Your integration tests pass. And yet users keep reporting broken checkouts, failed logins, and data that doesn't save. End-to-end testing is the safety net that catches what all your other tests miss — because it actually simulates what a real user does. Key Takeaways End-to-end
Testing
Database bugs are among the hardest to catch and the most expensive to fix. Data corruption, failed migrations, and broken queries don't always manifest in application tests — they often surface in production, after the fact. This guide covers database testing from the ground up: writing unit tests for
Testing
Cline has 4 million VS Code installs and is growing fast. It scaffolds entire features, runs terminal commands, and iterates on failures — which means it also generates a lot of code that needs testing. This guide covers how to test applications built with Cline: what kinds of bugs Cline code