This tests contains an app with a main page and sub pages. The main page contains a list of buttons; each button leads to a designated sub page when tapped on. Each sub page should displays some simple UIs to screenshot tested.

The flutter driver test runs the app and opens each page to take a screenshot.

Use test_driver/flutter_gold_main_test.dart to test against golden files stored on Flutter Gold. Otherwise, use main_test.dart to test against golden files stored on test_driver/goldens/<some_test_page_name>/<device_model>.png.

Note that new binaries can't be checked in the Flutter repo, so use Flutter Gold instead.

Add a new page to test

Create a new class which extends Page and implement the UI to be tested in the build method.
The new class should set a static title and key
Add an instance of the new class to the _allPages list in the main.dart
Create a new test case similar to "'A page with an image screenshot" in test_driver/main_test.dart to run the screenshot test.
Create directories for the test: test_driver/goldens/<some_test_page_name> should be created before running the test based on the target platform the test is designed to run.

An example of a Page subclass can be found in lib/image_page.dart

Environments

Device Lab which runs the app on iPhone 6s.
LUCI which runs the app on a Fuchsia NUC device.