How do you test a Flutter app (unit, widget, and integration testing)?

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Testing a Flutter app involves three main types: unit, widget, and integration testing, each targeting different layers of your application.

1. Unit Testing

Tests small, individual pieces of logic like functions, methods, or classes.

• Use: test package

2. Widget Testing (Component/UI Testing)

Tests a single widget's behavior and rendering in isolation.

• Use: flutter_test package (included by default)

• Simulates user interactions, verifies UI changes and state.

3. Integration Testing (End-to-End)

Tests the full app on a device or emulator, interacting with multiple widgets and services.

• Use: integration_test package

• Requires emulator/device and configuration

• Test files go in integration_test/ folder

Summary

• Use unit tests for logic

• Widget tests for UI components

• Integration tests for full workflows
  Combined, they ensure reliability, maintainability, and quality in your Flutter app.

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