[TASK] Add unit test to cover stdWrap_filelist

Resolves: #76738
Releases: master
Change-Id: Ia8e07d51d33e7cd49953cd4eb5c82f7e8dc80673
Reviewed-on: https://review.typo3.org/48641


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>