[TASK] Adjust tests for ClassLoadingInformationGenerator

This patch covers multiple testing scenarios to ensure the generator
class works properly with different user input.

Resolves: #70253
Releases: master
Change-Id: I1c6ab42caffc26bd544625a6bb6092988d99d6c4
Reviewed-on: http://review.typo3.org/43686


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>