[TASK] Add UnitTest for Compatibility7ExtractionUpdate

Change-Id: I2450313e4fb470a62f9bb4e371e0200c720bb4b5
Resolves: #83950
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/55771


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>