[TYPO3-core] FYI: #14635: caching framework file backend: Unit test fixes

[Christian Kuhn]

FYI: Attached patch was committed to trunk rev. 7825, 4.3 rev. 7826.

Type: bug, failing unit tests

Branches: 4.3 & trunk

BT: http://bugs.typo3.org/view.php?id=14635

Problem & Solution:
- glob() returns FALSE on some systems instead of an empty array, 
count($filesFound) == 0 fails then. Change the code so $filesFound is 
always an array.

- In flushRemovesAllCacheEntriesAndRelatedTags() the tag filenames are 
not calculated correctly, so the assertions are never FALSE, even if the 
tags are not deleted in the filesystem.

- tearDown() is no test and must not have @test annotation.

Regards
Christian
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