mock CACHE_TMP_DIR in test cases

[darkrush]

mock CACHE_TMP_DIR to “/tmp” to prevent permission denied

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@            Coverage Diff             @@
##              dev     #296      +/-   ##
==========================================
+ Coverage   89.57%   89.70%   +0.12%     
==========================================
  Files          82       82              
  Lines        5547     5556       +9     
==========================================
+ Hits         4969     4984      +15     
+ Misses        578      572       -6     

see 1 file with indirect coverage changes

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