What is mobile app testing? Unit tests, E2E tests, and devices

Mobile app testing combines different test scopes—unit, component, integration, and end-to-end—with environments such as local test runners, simulators or emulators, and physical devices, which address different risks and should not be confused. Teams can use tools including Jest and React Native Testing Library for React Native logic and components, XCTest and Espresso for native platforms, and Appium, Detox, or Maestro for installed-app automation, while cloud services provide access to varied real devices. Effective testing starts from controlled data and accounts, verifies resulting state rather than only visible messages, runs final checks on release builds, and includes failures such as lost connectivity, denied permissions, backgrounding, expired sessions, upgrades, accessibility, and hardware-dependent behavior. Reliable release decisions require linking every result to a specific build and commit, preserving failure logs, documenting tested journeys and known gaps, and selecting device coverage based on user needs. Expo supports Jest-based testing, development builds, and EAS workflows that can connect builds to Maestro tests, though virtual devices cannot replace physical-device checks for real performance, sensors, and native integrations.

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