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An introduction to widget testing - Flutter Widget-specific Matcher constants help verify whether a Finder locates a widget or multiple widgets in the test environment. If this sounds overwhelming, don't worry. Learn how all of these pieces fit together throughout this recipe, which uses the following steps: Add the flutter_test dependency. Create a widget to test. Create a testWidgets test.

Mock dependencies using Mockito - Flutter This recipe demonstrates the basics of mocking with the Mockito package using the following steps: Add the package dependencies. Create a function to test. Create a test file with a mock http.Client. Write a test for each condition. Run the tests. For more information, see the Mockito package documentation.

Accessibility testing - Flutter 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:

Handle scrolling - 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 flutter ...

Testing Flutter apps Testing a widget involves multiple classes and requires a test environment that provides the appropriate widget lifecycle context. For example, the Widget being tested should be able to receive and respond to user actions and events, perform layout, and instantiate child widgets.

Find widgets - Flutter To locate widgets in a test environment, use the Finder classes. While it's possible to write your own Finder classes, it's generally more convenient to locate widgets using the tools provided by the flutter_test package. 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 ...

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.

Capabilities & policies - Flutter Test the branching code by mocking capabilities and policies so the widget tests don't need to change when capabilities or policies change. Name the methods in your capabilities and policies classes based on what they are trying to branch, rather than on device type.

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 ...

Navigate to a new screen and back - Flutter In iOS, a route is equivalent to a ViewController. In Flutter, a route is just a widget. This recipe uses the Navigator to navigate to a new route. The next few sections show how to navigate between two routes, using these steps: Create two routes. Navigate to the second route using Navigator.push (). Return to the first route using Navigator ...