This one gives you a solid testing foundation across the mobile stack: Jest for React Native units, XCTest for iOS, Espresso for Android, and Detox or Appium for end-to-end flows. It lays out the testing pyramid with specific coverage targets (70% unit, 20% integration, 10% E2E) and includes working examples for login flows across platforms. Use it when you're setting up test infrastructure from scratch or debugging flaky tests in device farms. The best practices section is actually practical: test business logic first, mock dependencies, don't test implementation details. It won't solve platform-specific quirks for you, but it gets the architecture right.
npx skills add https://github.com/secondsky/claude-skills --skill mobile-app-testing