Agent skill

test-implement

Test implementation patterns and conventions. Use when implementing unit tests, integration tests, or E2E tests, including RTL+Vitest+MSW component testing and Playwright E2E testing.

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npx add-skill https://github.com/shinpr/claude-code-workflows/tree/main/skills/test-implement

SKILL.md

Test Implementation Patterns

Reference Selection

Test Type Reference When to Use
Unit / Integration references/frontend.md Implementing React component tests with RTL + Vitest + MSW
E2E references/e2e.md Implementing browser-level E2E tests with Playwright

Common Principles

AAA Structure

All tests follow Arrange-Act-Assert:

  • Arrange: Set up preconditions and inputs
  • Act: Execute the behavior under test
  • Assert: Verify the expected outcome

Test Independence

  • Each test runs independently without depending on other tests
  • No shared mutable state between tests
  • Deterministic execution — no random or time dependencies without mocking

Naming

  • Test names describe expected behavior from user perspective
  • One test verifies one behavior

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