Mobile Testing

Jest and React Native Testing Library are the standard testing setup for React Native. Install them as dev dependencies (npm install --save-dev jest @testing-library/react-native), configure Jest in your project, add test scripts to package.json, and you're ready to write and run tests for components, hooks, and utilities.

Unit testing React Native components uses React Native Testing Library to render components and query by accessible elements rather than implementation details. The Skill provides ready-to-use test templates for components that follow best practices, reducing setup time and ensuring consistent test patterns across your project.

Test coverage reports show which lines of code are executed during tests. Run jest --coverage to generate coverage reports for your React Native codebase. The Skill includes npm scripts for automated coverage reporting, helping you identify untested code and track coverage over time.

Yes, React Native Testing Library supports testing custom hooks and utility functions alongside components. The Skill provides separate test templates and patterns for hooks and utilities, covering common testing scenarios like state updates, side effects, and pure utility logic.

Mocking isolates code under test by replacing external dependencies. The Skill establishes mocking patterns for Jest in React Native contexts—covering modules, API calls, and native dependencies—with template examples you can adapt to your specific testing needs.

Debugging failed tests involves running tests in watch mode, inspecting error output, and isolating failures. The Skill supplies npm scripts and workflows for running tests interactively and generating detailed failure reports, helping you pinpoint and fix issues quickly.