[TASK] Add unit test to cover stdWrap_setCurrent

Resolves: #76634
Releases: master
Change-Id: If532940407542d3c62edb98e23ffe1037a4eb43c
Reviewed-on: https://review.typo3.org/48581


Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>