Of course it does not feel good to introduce duplicated code en mass, but we need to start somewhere.

• I duplicated parameters and UpdateParentMojo#resolveTargetVersion to DisplayParentUpdatesMojo.
• I duplicated UpdateParentMojoTest to DisplayParentUpdatesMojoTest. All tests asserting the actual updates are ignored at the moment. I need to figure out how to assert the actual console output.

I added another Test, DisplayParentUpdatesMojoOutputTest which is based on AbstractMojoTestCase like all other Display*Tests. As soon as I add a parent to my test-cases pom, test execution will fail with

java.lang.IllegalArgumentException: Invalid repository system session: LocalRepositoryManager is not set.

This is coming from DefaultRepositorySystem::validateSession, which is usually called -- too bad you didn't provide a stack trace ;) -- from RepositorySystem::resolveVersion.

You either need to mock the call so that it returns what you want (see e.g. MockUtils) or just use the regular integration tests (the "it" directory).

Good luck!

Hi @cachescrubber, do you need any more assistance with the failing tests?

@ajarmoniuk I gave up on the *Output test. Instead, I aligned DisplayParentUpdatesMojoOutputTest (new) with UpdateParentMojoTest. Could you please review my changes?

@slawekjaranowski please approve the workflow and/or raise additional PR commments.