[TASK] Avoid superfluous Reflection invocation in tests

Resolves: #90086
Releases: master, 9.5
Change-Id: Ibe5eb0db866933984a07ac5f5b82010a0ae4698b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62844


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tobi Kretschmann <tobi@tobishome.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Tobi Kretschmann <tobi@tobishome.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>