testing▌

Test-Driven Development (TDD):

Expert guidance for designing statistically valid A/B tests and experiments. \n \n Provides a structured hypothesis framework, sample size calculations, and metrics selection (primary, secondary, guardrail) to ensure rigorous test design \n Covers test types (A/B, A/B/n, MVT, split URL), traffic allocation strategies, and implementation approaches (client-side vs. server-side) \n Includes pre-launch checklists, guidance on avoiding common pitfalls like early peeking, and frameworks for analyzing

Generate comprehensive test plans, test cases, regression suites, and bug reports with Figma design validation. \n \n Create structured test plans with scope, strategy, entry/exit criteria, risk assessment, and timelines \n Generate manual test cases with step-by-step instructions, expected results, preconditions, and priority levels \n Build regression test suites (smoke, targeted, full) with execution order and pass/fail criteria \n Validate UI implementations against Figma designs with compon

Systematically identify and fix all failing tests using smart grouping strategies.

Vite-powered unit testing framework with Jest-compatible API and native ESM support. \n \n Jest-compatible test syntax (test/describe/expect) with drop-in replacement capability for most Jest suites \n Native support for ESM, TypeScript, and JSX without additional configuration; shares Vite's transformation pipeline \n Smart watch mode reruns only affected tests based on module graph; multi-threaded workers enable parallel execution \n Built-in mocking (functions, modules, timers), snapshot test

Complete E2E and integration testing for TypeScript/NestJS projects with real Docker infrastructure and GWT pattern. \n \n Supports six guided workflows: setup, writing, reviewing, running, debugging, and optimizing E2E tests \n Tests against real services (PostgreSQL, MongoDB, Redis, Kafka) via Docker; never mocks infrastructure \n Enforces Given-When-Then pattern, test isolation, and specific assertions across all test cases \n Includes technology-specific helpers, rules, and examples for Kafk

Generate Vitest and React Testing Library tests for Dify frontend components, hooks, and utilities. \n \n Covers component rendering, props validation, user interactions, edge cases, and async operations with Vitest 4.0.16 and React Testing Library 16.0 \n Enforces incremental, one-file-at-a-time testing workflow for multi-file directories; process by complexity (utilities → hooks → simple components → complex components → integration) \n Requires integration-first approach: import real project

Discover and test everything. Leave no route untested.

Use this skill when:

Comprehensive patterns for writing maintainable, effective vitest tests. Focused on expert-level guidance for test organization, clarity, and performance.