An introduction to widget testing - Flutter In the introduction to unit testing recipe, you learned how to test Dart classes using the test package To test widget classes, you need a few additional tools provided by the flutter_test package, which ships with the Flutter SDK The flutter_test package provides the following tools for testing widgets: The WidgetTester allows building and interacting with widgets in a test environment The
Testing Flutter apps Widget tests A widget test (in other UI frameworks referred to as component test) tests a single widget The goal of a widget test is to verify that the widget's UI looks and interacts as expected Testing a widget involves multiple classes and requires a test environment that provides the appropriate widget lifecycle context
Flutter > How to handle scrolling in a widget test Many apps feature lists of content, from email clients to music apps and beyond To verify that lists contain the expected content using widget tests, you need a way to scroll through lists to search for particular items To scroll through lists via integration tests, use the methods provided by the [`WidgetTester`][] class, which is included in the
Tap, drag, and enter text - Flutter In the test environment, Flutter doesn't automatically rebuild widgets when the state changes To ensure that the widget tree is rebuilt after simulating a user interaction, call the pump() or pumpAndSettle() methods provided by the WidgetTester This recipe uses the following steps: Create a widget to test Enter text in the text field
Handle scrolling - Flutter 2 Write a test that scrolls through the list Now, you can write a test In this example, scroll through the list of items and verify that a particular item exists in the list The WidgetTester class provides the scrollUntilVisible() method, which scrolls through a list until a specific widget is visible
Find widgets - Flutter During a flutter run session on a widget test, you can also interactively tap parts of the screen for the Flutter tool to print the suggested Finder This recipe looks at the find constant provided by the flutter_test package, and demonstrates how to work with some of the Finders it provides
Testing each layer - Flutter Testing the UI layer One way to determine whether your architecture is sound is considering how easy (or difficult) the application is to test Because view models and views have well-defined inputs, their dependencies can easily be mocked or faked, and unit tests are easily written
Accessibility testing - Flutter Testing accessibility on mobile Test your app using Flutter's Accessibility Guideline API This API checks if your app's UI meets Flutter's accessibility recommendations These cover recommendations for text contrast, target size, and target labels The following snippet shows how to use the Guideline API on a sample widget named AccessibleApp:
Stack-based navigation - Flutter Navigator of (context) retrieves the nearest Navigator widget from the widget tree The push method adds a new route to the navigator's stack, and displays the widget returned from the builder property This is the most basic implementation of using stack-based navigation, where new screens are pushed on top of the current screen