Use SQLite tests to improve code coverage.

[marcinslusarz]

This change is 

[codecov-io]

Codecov Report

Merging #318 into master will increase coverage by 0.68%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #318      +/-   ##
==========================================
+ Coverage    77.5%   78.18%   +0.68%     
==========================================
  Files          90       90              
  Lines       13811    13819       +8     
  Branches     1994     1994              
==========================================
+ Hits        10704    10805     +101     
+ Misses       2383     2293      -90     
+ Partials      724      721       -3

Impacted Files	Coverage Δ
src/libpmemfile-posix/data.c	91.92% <0%> (-0.36%)	:arrow_down:
src/libpmemfile-posix/rename.c	90.4% <0%> (-0.33%)	:arrow_down:
src/libpmemfile-posix/file.c	67.03% <0%> (+0.27%)	:arrow_up:
src/libpmemfile-posix/utils.c	73.43% <0%> (+0.42%)	:arrow_up:
src/libpmemfile-posix/write.c	87.01% <0%> (+1.29%)	:arrow_up:
src/libpmemfile-posix/dir.c	83.29% <0%> (+1.47%)	:arrow_up:
src/libpmemfile/path_resolve.c	87.65% <0%> (+2.02%)	:arrow_up:
src/libpmemfile-posix/read.c	93.19% <0%> (+2.85%)	:arrow_up:
src/libpmemfile/preload.c	48.69% <0%> (+4.76%)	:arrow_up:
src/libpmemfile/libpmemfile-posix-wrappers.h	54.28% <0%> (+6.85%)	:arrow_up:
... and 3 more

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[marcinslusarz]

0.68% is not much, but it's something :).

[krzycz]

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Reviewed 3 of 3 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[sarahjelinek]

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Review status: :shipit: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable