callstack/react-native-testing-library
React Native Testing Library
This project is a testing framework designed for React Native applications, providing a suite of tools to render components in a controlled memory environment. It enables developers to verify the behavior and structure of mobile interfaces by simulating user interactions and monitoring component lifecycle transitions. By isolating components from the rest of the application, it ensures that tests remain stable and independent.
The framework distinguishes itself through an accessibility-first approach, prioritizing user-facing attributes like roles, labels, and text content when querying the component tree. This methodology ensures that tests reflect how a real user perceives and interacts with the interface, rather than relying on internal implementation details. It also includes robust support for asynchronous operations, automatically synchronizing assertions with background state updates and delayed UI rendering to prevent race conditions.
Beyond core rendering and interaction, the library provides comprehensive capabilities for validating UI state, inspecting component styles, and verifying accessibility properties. It supports testing custom hooks in isolation, managing complex component trees through provider injection, and performing structural verification via snapshots. These features allow for thorough quality assurance across various mobile interface scenarios.
