[TASK] Refactor unit test to cover stdWrap_expandList

Releases: master
Resolves: #76776
Change-Id: I0819dbf7a44286545a38837e3fbd4e1cac059f54
Reviewed-on: https://review.typo3.org/48683


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>