On branch 4.5.x (maybe on master, too, must be checked) lots of test are failing when runned with intelliJ.
This happens when the sub-projects of main are imported alltogether with the paren-pom of the main project (which is the usual case).
For an overview of the not working tests see screenshot.

There is a "workaround" to set the working directory for the test explicitely. (see screenshot). Or. alternatively, the sub-project which contains the test can be imported "stand-alone".
But ususally developers rely on that a test just cen be run after having checked it out from git without any speclai settings.

So. All the unit test must work with "usual" project-imports without any IDE-settings for the test.