[TASK] Add unit test to cover stdWrap_fieldRequired

Releases: master
Resolves: #76764
Change-Id: Id0010c8d30888401c7a94642549b01af9f5383ee
Reviewed-on: https://review.typo3.org/48660


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>