Testing
APIs are where most modern application logic lives — and where most security vulnerabilities occur. REST APIs, GraphQL endpoints, and WebSocket connections are all attack surfaces that need explicit security testing. Postman is a tool most developers and QA engineers already have. Beyond basic functional testing, it's surprisingly capable
Testing
Snapshot testing is associated with UI components — you render a tree, save it, and fail if it changes. But the same technique works exceptionally well for API responses, and for many teams it's more valuable there than in the UI layer. API responses are structured, deterministic (once you
Testing
Writing Ansible roles without tests is a recipe for broken playbooks. Molecule is the official testing framework for Ansible roles and collections. It lets you spin up containers, run your role against them, verify the results, and tear everything down — all with a single command. This guide covers Molecule with
Testing
Most Ansible roles are never tested. You write the role, run it on a server, see that it "works," and commit. The next engineer who touches it runs into a failure on Ubuntu 22 that worked on Ubuntu 20, or discovers the role isn't idempotent — running
Testing
Angular services are where most of the application's business logic lives. They're also easier to test than components — no DOM, no templates, just TypeScript classes that take inputs and produce outputs. This guide covers every pattern you'll need to test services properly. Testing a
Testing
Reactive forms are the preferred way to handle complex form logic in Angular. They're also well-suited to testing because the form model is a plain TypeScript object — you can set values, trigger validation, and inspect state without touching the DOM at all. This guide covers every pattern
Testing
Protractor reached end-of-life in 2023. If you're still running it, you're on borrowed time — unmaintained dependencies, no Chromium updates, and no support for modern Angular features. Playwright is the replacement worth betting on: faster, more reliable, and actively maintained by Microsoft. This guide covers
Testing
Angular's TestBed is the primary tool for unit testing components. It creates a mini Angular module in memory, compiles your component, and lets you interact with it the same way Angular's runtime would. This guide walks through every pattern you'll hit in real projects.
Testing
ViewModels are the core of Android architecture: they hold state, handle business logic, and expose data via Kotlin Flow. Testing them thoroughly — including loading states, error handling, and side effects — requires understanding how to control coroutines and observe Flow emissions in tests. This guide covers ViewModel testing with TestDispatcher, Turbine
Testing
Unit tests on Android have a reputation for being awkward. Some of that is earned — the platform is deeply tied to Android SDK classes that require a device or Robolectric to instantiate. But most Android logic that matters can be tested in pure JVM unit tests if you structure the
Testing
Android instrumentation tests run on a real device or emulator. That means every test suite invocation involves booting an emulator, installing an APK, and waiting for the Android runtime to execute your code. A test suite that takes 20 seconds on a laptop can take 10 minutes in CI. Robolectric
Testing
Getting Android tests running in GitHub Actions is straightforward. Getting them running fast and reliably is not. The emulator is the bottleneck: it's a full Android system image running in a VM, inside a GitHub Actions runner. There's overhead at every layer. This guide covers a