Additional test coverage

[jtnord]

What feature do you want to see added?

CloudBees has maintained it's own extended set of tests for some open source plugins.

These internal tests don't benefit the community as much as they could as there is no visibility of them outside of CloudBees.

They are run on every build of our product (many times per day) without any surefire re-runs enabled and so are considered as stable as the ATHs in this repository.

We intend to open source these tests by migrating them to this repository where the tests do not significantly overlap.

This ticket is so you are aware of this upcoming work @timja @NotMyFault

Upstream changes

No response