Kotlin
Espresso is Android's UI testing framework, executing tests directly on a device or emulator. This guide covers the full Espresso toolkit: ViewMatchers for finding views, ViewActions for interacting, ViewAssertions for validating state, IdlingResources for async synchronization, and Hilt for injecting test dependencies. Unit tests tell you your logic
Elixir
Phoenix LiveView's test module gives you a full server-side rendering environment without a browser. This post covers mounting views, simulating user interactions, testing navigation, form submission, JS hook callbacks, and real-time push events — all in fast, deterministic ExUnit tests. LiveView moved the rendering loop to the
Spring Boot
Spring Security is the most undertested layer in most Spring Boot apps. This post shows how to use @WithMockUser, @WithSecurityContext, mockJwt(), and method security tests to actually verify your authorization rules. Security is the layer where bugs have the worst consequences — an unprotected endpoint or a misconfigured role check is
Spring Boot
@DataJpaTest loads only the JPA layer — no controllers, no services, no security. Pair it with TestEntityManager for precise fixture control, and Testcontainers PostgreSQL when H2 is not enough. This post covers all the patterns you need for a solid repository test suite. The repository layer is where your application talks
Testing
Docker Compose is the standard way to run multi-service integration tests locally and in CI. Use docker compose up --wait with healthchecks to ensure services are ready before tests run. Run tests against the composed services from the host or from a test runner container. Always clean up with
Testing
* Artillery uses YAML config files to define load scenarios and HTTP targets * artillery-pro / cloud mode distributes load across multiple worker machines * AWS Lambda backend lets you generate load without managing servers * Results from all workers are aggregated into a single report * Regression detection compares p95/p99 latency against baseline
Testing
Agentic AI evaluation goes beyond single-turn accuracy. Measure task completion rate, tool-call precision/recall, step efficiency, and trajectory quality. A 90% single-turn accuracy agent can still fail 40% of multi-step tasks due to error propagation. Evaluate the full trajectory, not just the final answer. Single-turn
Flutter
Flutter integration tests run your full app on a real device or emulator — no mocks, no shortcuts. This guide covers the integration_test package from scratch: setup, writing tests, managing app state between tests, running on CI, and gotchas that will save you hours of debugging. Key Takeaways * integration_test
Flutter
Flutter widget tests let you verify UI components in isolation — faster than integration tests, more reliable than manual checks. This guide covers the full flutter_test toolkit: testWidgets, WidgetTester, pump/pumpAndSettle, finders, and matchers with production-ready code examples. Key Takeaways * Widget tests run in a simulated environment — no emulator
GraphQL
Apollo Client components are hard to test without the right tools because they depend on a live GraphQL server. Apollo's MockedProvider lets you define expected operations and their responses, so you can test components in complete isolation. This guide covers the full spectrum: loading states, successful responses, errors,
Testing
Integrating accessibility testing into CI/CD means every code change is automatically checked for WCAG violations before it reaches production. This prevents accessibility regressions — where a change that broke accessible behavior slips through unnoticed. This guide covers how to set up automated accessibility checks in GitHub Actions, what tools to
Testing
Voice UI testing is conversation graph testing. Every intent is a node, every response is an edge. Test happy paths through the conversation tree, test slot validation for all entity types, test session persistence across turns, and test what happens when users say unexpected things at every state. Use ask-