@Override
    protected LightProjectDescriptor getProjectDescriptor() { return descriptor; }
Parent of unit tests. This is an antipattern, but mandated by IntelliJ.

NOTE: Sometimes, unit tests will stop working with IntelliJ-interna. exceptions. To fix this,
      run the first step of "File -> Repair IDE": "Refresh indexable files"

@author bratseth
integration/intellij/src/test/java/ai/vespa/intellij/PluginTestBase.java