Can UI components be tested through JUnit/GWTTestCase?

Ok, I found some old messages (several years old) that says this
cannot be done.

However, when I look at:
https://developers.google.com/web-toolkit/doc/latest/DevGuideTesting#DevGuideJUnitSetUp

this seems to imply that you can actually test GUI items on a browser
with such tests. I might well be completely misinterpreting what it's
there for, though.

However, I'm baffled as to how to do so.

For example, I might normally put MyWidget into the RootPanel as
follows:

RootPanel.get().add(new MyWidget("Some text here"));

But how would I do this in a JUnit test case / GWTTestCase?

Thanks.

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