[TASK] Refactor unit test to cover stdWrap_bytes

Resolves: #76782
Releases: master
Change-Id: Ic594498a8aba1d6b248db4ca9441e143f1d5841b
Reviewed-on: https://review.typo3.org/48702


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>