[TASK] Unit test to cover stdWrap_cacheRead

Releases: master
Resolves: #76713
Change-Id: I2dee09cfda238a0413abd5c2f691aaf596e5323d
Reviewed-on: https://review.typo3.org/48621


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