[TYPO3-core] FYI: committed the first unit tests for the updated caching framework (part of #10614)

[Niels Pardon]

Hi Ingo!

Ingo Renner schrieb:
>     ...As far as I remember this should be the correct way anyways,
> right?! - First create the tests and then make the code pass them...

This is right for your development workflow. But if you commit the tests
to the repository you should commit the tested code, too.

As Oli mentioned: Broken tests in the repository are not very nice for
other developers.

Greets,

Niels