[TASK] Add unit test to cover stdWrap_preUserFunc

Releases: master
Resolves: #76740
Change-Id: I6180c26a8e9f3d32583b78092ee00e981543b0c2
Reviewed-on: https://review.typo3.org/48642


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Susanne Moog <typo3@susannemoog.de>
Tested-by: Susanne Moog <typo3@susannemoog.de>