We have full OOBE end-to-end test "OobeInteractiveUITest.SimpleEndToEnd": https://cs.chromium.org/chromium/src/chrome/browser/chromeos/login/oobe_interactive_ui_test.cc?l=260 which verifies all OOBE steps including First Run UI (and makes sure it is closed at the end).

But it does not cover ARC++-specific screens. We need to add another test "OobeInteractiveUITest.WithARCEnabled" that will go through the all screens, including ARC++ ones. Basically we need to copy "SimpleEndToEnd" and enable ARC++.

The goal is to verify that our OOBE + First Run flow is correctly displayed, and can be correctly navigated through. (And that dependencies are resolved correctly). We do not need to test too much of the functionality of the individual screens/dialogs, but some basic checks are very welcome (see existing checks).

Feel free to add as many First run flows as you can ;)