mobile-app-testing_skill

Overview

This skill provides a production-ready approach to mobile app testing covering unit tests, UI automation, and performance checks. It includes patterns and examples for React Native, iOS, and Android, plus guidance for test infrastructure and device farms. The focus is practical: reduce flakiness, validate critical user flows, and keep tests maintainable and fast.

How this skill works

The skill maps the testing pyramid to concrete tools: Jest/XCTest/JUnit for unit tests, Detox/Espresso for integration, and Appium/Detox for end-to-end scenarios. It supplies examples for common flows (login, cart calculations) and prescribes mocking, device selection, and CI strategies. Use it to inspect failing tests, configure frameworks, or design a balanced test suite across layers.

When to use it

• Setting up or standardizing test infrastructure for a mobile project
• Adding E2E or UI automation for critical user journeys
• Diagnosing flaky tests or platform-specific test failures
• Planning test coverage and shifting-left testing efforts
• Integrating device farm runs into CI/CD pipelines

Best practices

• Start with unit tests for business logic before automating UI flows
• Mock external dependencies to keep tests deterministic
• Automate only critical user flows in E2E to limit maintenance
• Run tests on a mix of emulators and real devices regularly
• Avoid testing implementation details and hardcoded data

Example use cases

• Write Jest unit tests for a React Native cart service and run in CI
• Create Detox E2E tests for login and checkout flows on iOS and Android
• Use XCTest and Espresso snippets to reproduce platform-specific UI bugs
• Integrate Appium with a device farm for cross-device compatibility checks
• Identify and isolate flaky tests, then add retries or improve selectors