To execute, run mvn -Pdevmode - there will be a stack trace at the end which you can ignore for now, just a quirk of a local chromedriver not shutting down.

Right now it requires that chromedriver is on your PATH so that a browser can be started for the test, but we'll update the tooling to support more RunStyle-like behavior (as GWT2 has) as the tool gets formalized and made part of the gwt3 maven plugin.