testing▌

Write the test first. Watch it fail. Write minimal code to pass.

Expert knowledge for browser automation and end-to-end testing with Playwright - a modern cross-browser testing framework.

Cypress runs browser automation with first-class network control, time-travel debugging, and a strong local dev workflow. Use it for critical path E2E tests and for component tests when browser-level rendering matters.

Vitest is a next-generation testing framework powered by Vite. It provides a Jest-compatible API with native ESM, TypeScript, and JSX support out of the box. Vitest shares the same config, transformers, resolvers, and plugins with your Vite app.

Normative: Test failures must be diagnosable without reading the test source.

Use this skill when managing TestFlight testers, groups, and build distribution.

Web application testing and automation using Playwright with managed server lifecycle. \n \n Includes with_server.py helper script to automatically start and manage single or multiple local servers (backend, frontend, etc.) before running automation scripts \n Provides a reconnaissance-then-action pattern: navigate, wait for network idle, take screenshots, inspect DOM, identify selectors, then execute actions \n Supports both static HTML (file:// URLs) and dynamic webapps; includes example scrip

Test @Scheduled and @Async methods directly without waiting for actual execution. \n \n Call async and scheduled methods directly in tests instead of relying on Spring's async executor or scheduling intervals \n Use CompletableFuture.get() with explicit timeouts to wait for async results, and Awaitility.await() for polling-based assertions on state changes \n Mock dependencies that async methods call, then verify interactions after completion using Mockito \n Test exception handling by catching

Unit testing patterns for Spring Security authorization annotations and role-based access control. \n \n Covers @PreAuthorize , @Secured , and @RolesAllowed method-level security with @WithMockUser test fixtures \n Includes role-based access control (RBAC), expression-based authorization, and custom PermissionEvaluator testing \n Provides MockMvc patterns for testing secured REST endpoints and parameterized role testing strategies \n Demonstrates both allow and deny scenarios, owner-based access

Comprehensive testing strategies for LangChain4j applications with mocks, containers, and RAG validation. \n \n Provides unit testing patterns with mock models, integration testing via Testcontainers, and end-to-end workflows for RAG systems, AI Services, and tool execution \n Covers testing pyramid approach: 70% unit tests with mocks, 20% integration tests with real services, 10% end-to-end tests \n Includes specialized patterns for streaming responses, memory management, guardrail assertions,