Rust
Rust's built-in #[bench] attribute requires nightly and lacks statistical rigor. Criterion.rs is the de facto standard for benchmarking on stable Rust: it handles warm-up, measures statistical variance, compares runs against baselines, and produces HTML reports. Installation [dev-dependencies] criterion = { version = "0.5", features = ["html_reports&
Rust
cargo-nextest is a next-generation test runner for Rust that replaces cargo test with a process-per-test execution model, better terminal output, built-in retry logic, and significantly faster CI runs. It's a drop-in replacement — your existing tests work unchanged. Why nextest? cargo test runs tests in threads within a single
Kotlin
Android has two types of tests: unit tests (JVM, fast) and instrumented tests (run on a device or emulator, access Android APIs). Instrumented tests are required for testing UI behavior, database operations, and anything that depends on the Android framework. This guide covers instrumented tests using Espresso for View-based UI
Rust
Rust ships with a built-in test framework. No extra dependencies, no configuration files — just annotate a function with #[test] and run cargo test. That simplicity is deceptive: the Rust test model covers unit tests, integration tests, doc tests, and benchmarks within a single coherent workflow. This guide covers everything you
Rust
Rust's borrow checker and type system make certain mocking patterns harder than in dynamic languages, but the mockall crate brings first-class mocking support to Rust's test ecosystem. This guide covers the practical patterns you'll reach for in real projects. Why Mock? Mocks replace real
Test Automation
.NET has a mature test automation ecosystem built around three layers: unit tests (xUnit/NUnit/MSTest + Moq), integration tests (WebApplicationFactory, Testcontainers), and end-to-end tests (Playwright, Selenium). This guide covers setting up all three layers, structuring a test project, running tests in CI, and measuring coverage. Key Takeaways Three-layer testing is
Integration Testing
Integration testing in .NET means testing your application with real dependencies — real HTTP routing, real database queries, real middleware. WebApplicationFactory from Microsoft.AspNetCore.Mvc.Testing spins up your actual ASP.NET Core app in memory, letting you send real HTTP requests without a running server. This guide covers setup, database
Tools & Frameworks
Moq is the most popular mocking library for .NET. It lets you replace real dependencies (databases, email services, HTTP clients) with controlled fakes in unit tests. This guide covers Setup, Verify, argument matchers, callbacks, async mocks, and common patterns for writing isolated C# tests. Key Takeaways Mock<T>
Flutter
Flutter golden tests capture a screenshot of a widget and compare it pixel-by-pixel against a reference image (the "golden file"). If the screenshot changes, the test fails. This catches visual regressions — layout shifts, color changes, font differences — that behavioral tests miss entirely. This guide covers writing golden tests,
Angular
Playwright is the recommended E2E testing framework for Angular applications in 2026, replacing the deprecated Protractor. It supports auto-waiting, multi-browser testing, network interception, and trace capture out of the box. This guide covers adding Playwright to an Angular project, writing effective E2E tests, and deciding when to use Angular CDK
TypeScript
TypeScript mocking has one goal: replace real dependencies with test doubles that are fully type-checked. The toolbox includes jest.fn() with generic parameters, jest.Mocked for class/interface mocks, jest.spyOn for partial mocks, and ts-mockito for fluent mock setup. This guide covers each pattern with realistic examples and explains
Vue.js
Cypress component testing runs Vue components in a real browser — not jsdom, not a virtual DOM. This means your CSS is applied, browser APIs work correctly, and user interactions behave exactly as they do in production. Unlike Vitest + Vue Test Utils which runs in Node, Cypress component tests give you