RFR: 8339170: ☂ Convert tests to JUnit 5

[Kevin Rushforth]

On Fri, 11 Apr 2025 20:36:48 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

> These are the remaining bits and pieces in order to completely remove the JUnit Vintage Engine, and therefore JUnit 4 from JavaFX.
> After that, we should either document, that JUnit5 is used (just as information) or close [JDK-8296284](https://bugs.openjdk.org/browse/JDK-8296284) (Since you can not use JUnit4 anymore).
> 
> This also removes the `org.hamcrest` dependency, which is actually only used in one test where it can easily be replaced by a `Predicate` (instead of `Matcher`). I'm not convinced that we should keep that dependency for just one test.
> 
> Note: I could not get the `:swt` tests to compile/test, in order to run the tests. 
> I need some guidance here how to instruct `Gradle` to compile this module (and if I need anything else? like swt?).
> 
> Also, this probably needs an extra ticket in the JBS?

@Maran23 We don't integrate code using the JBS ID of an umbrella tasks. If there is a need for a follow-on, 
we would file a new Bug or Enhancement issue in JBS and link it to the umbrella.

For this specific case, this PR may be premature. We have closed tests that still use JUnit 4, and this might break our build. I'll check next week.

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PR Comment: https://git.openjdk.org/jfx/pull/1774#issuecomment-2798003492