[TASK] Add unit test to cover ContentObjectRenderer::calculateCacheKey

Resolves: #76718
Releases: master
Change-Id: I99321eb5d0f8b1ec642e65cdbcb229c7ca6957b2
Reviewed-on: https://review.typo3.org/48623


Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
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>