[code mining] Consider adding JUnit minings / debugging minings

[JanecekPetr]

The original code mining repo, https://github.com/angelozerr/jdt-codemining, has a few more tricks than the current JDT. Namely,

• JUnit minings for running specific tests, seeing their status: https://github.com/angelozerr/jdt-codemining/tree/master/org.eclipse.jdt.codemining/src/org/eclipse/jdt/experimental/junit/codemining
• an incredible debug mining showing variable values inline, https://github.com/angelozerr/jdt-codemining/tree/master/org.eclipse.jdt.codemining/src/org/eclipse/jdt/experimental/debug/ui/codemining
• (and var local inference type, https://github.com/angelozerr/jdt-codemining/tree/master/org.eclipse.jdt.codemining/src/org/eclipse/jdt/experimental/ui/javaeditor/codemining/var, already requested by [code mining] show inferred type for local "var" statements #329)

Are we considering adding any of those? I'd gladly help with asking for permission from the original author, if needed, and integrating the cleaned-up code into JDT if that helps in any way.

[jukzi]

Maybe you can share a screenshot what it would look like?
Is there a reason why it should be implemented in JDT instead of a plugin on top?

[carstenartur]

What contribution is welcome and where do you prefer it to be kept separate? In fact I was thinking about contributing a cleanup to migrate junit 4 to junit 5. definitly this is junit specific. On the other side there is already a lot of junit specific code in jdt and jdts test itself are based on junit too.
See carstenartur/sandbox#110

[jukzi]

Good question, I'd say java specific thinks belong to the scope of JDT.UI. JUnit does not, but is interesting for the eclipse ide as a whole. I actually would try to use it to convert SWT to junit 5. The problem i see is that as the codebase grows it is hard to maintain. Often edge cases remain unsolved which gives a bad light on jdt.

[carstenartur]

Imho the strong connection of junit and Eclipse is a strength and has a reason: Erich Gamma, famous member of the gang of four and involved in the early days of Eclipse and JUnit at the same time.

https://www.infoq.com/interviews/gamma-jazz-eclipse-junit-design-patterns/