Now that flutter test --platform=chrome supports dart defines, I've added the ability to run the existing test suite with canvaskit enabled. Unfortunately, the vast majority of these tests are failing:

https://ci.chromium.org/ui/p/flutter/builders/try/Linux%20web_tests/6679/steps?succeeded=true&debug=false

This has already helped identify one issue in the web engine: flutter/engine#22809 . Consider triaging the rest to find the common error cases. To run with canvaskit enabled locally:

flutter test --platform=chrome --dart-define=FLUTTER_WEB_USE_SKIA=true test/file_to_test.dart