fix dm hover test on j 21

[cdietrich]

No description provided.

[LorenzoBettini]

But this would work only in Java 21, not in previous versions.

[cdietrich]

I don’t understand
See my change in reference projects

[LorenzoBettini]

I mean that the modified test will rely only on the new Javadoc of List introduced in Java 21. In previous versions of Java it will fail because the Javadoc was different. If we're sure we change the domainmodel to require Java 21, then no problem.

Otherwise

• we rely on a custom stubbed class with a fixed javadoc (see my other changes in Initial preparation for Java 21 #2986, which is the safest choice because we have full control)
• we use the check for the current Java version and specify the assertions accordingly
• we introduce a less strict method in the hover test, something like hasHoverContaining

[cdietrich]

i dont understand.
https://github.com/xtext/xtext-reference-projects/actions/runs/8813287543
dm is green here will all java versions

hasHoverOver is a containing check

[LorenzoBettini]

Sorry, I missed the fact it was already a containing check.

And sorry: I thought you changed the tests to add the (also known as a <i>sequence</i>), instead you changed it to remove it because it disappeared from Java 21 javadoc.

Sorry for the noise, I now understand :)