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The widget preview scaffold requires that previews are defined within importable libraries. Since Dart does not support absolute paths for imports or relative imports outside of the project, it's not possible for the widget previewer to display previews defined outside of `lib/`. This change updates the preview detector to ignore libraries that don't have a package name (e.g., libraries under `test/`) and updates `packageName` properties to not allow for null to make it clear that package names are required for previews. Fixes https://github.com/flutter/flutter/issues/178651
Automated Flutter integration test suites
Each suite consists of either a complete Flutter app and a flutter_driver
specification that drives tests from the UI, or a native app that is meant to
integrate with Flutter for testing.
Intended for use with devicelab tests.
If you want to run a driver test locally, to debug a problem with a test, you can use this command from the appropriate subdirectory:
flutter drive -t <test> --driver <driver>
For example:
flutter drive -t lib/keyboard_resize.dart --driver test_driver/keyboard_resize_test.dart
New tests require new CI runner
Adding code to this directory will not automatically cause it to be run by any already existing ci tooling. This directory is intentinally a "choose your own adventure" piece of tooling.