test cache page allocation failure

[rrrrrrmb]

This PR solves #442. This test creates an entry structure to initialize the cache and then creates more structures to fill the cache until a new page allocation fails.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.59%. Comparing base (afdc224) to head (26a252e).
Report is 2 commits behind head on latest.

Additional details and impacted files

@@            Coverage Diff             @@
##           latest     #464      +/-   ##
==========================================
+ Coverage   90.54%   90.59%   +0.04%     
==========================================
  Files          47       47              
  Lines        4379     4379              
  Branches      587      587              
==========================================
+ Hits         3965     3967       +2     
+ Misses        280      279       -1     
+ Partials      134      133       -1     

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[goatshriek]

Your test works perfectly, and has in fact uncovered a memory leak!

The result of realloc_mem on line 70 of src/cache.c isn't dealt with properly in the case of failure. The easiest solution here would be to move the assignment currently on line 83 to before the alloc call, so that the cache has the new structure even in the case of an error. If you'd like to give that a shot please do, or if you see a better solution you can try that instead.

[rrrrrrmb]

Thanks for the hint ! I've made the suggested change and looks like that fixed it :)