Unit testing of metadata

[suvi-123]

No description provided.

[codecov]

Codecov Report

Merging #184 (2f45d1c) into master (ad1fe34) will increase coverage by 4.20%.
Report is 20 commits behind head on master.
The diff coverage is 85.36%.

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
+ Coverage   49.10%   53.31%   +4.20%     
==========================================
  Files          29       30       +1     
  Lines        8025     8369     +344     
==========================================
+ Hits         3941     4462     +521     
+ Misses       4084     3907     -177     

Files	Coverage Δ
src/webcfg_metadata.c	67.74% <100.00%> (+41.90%)	⬆️
tests/test_metadata.c	98.43% <100.00%> (+6.94%)	⬆️
src/webcfg_multipart.c	36.08% <0.00%> (-0.11%)	⬇️
tests/test_db.c	48.14% <0.00%> (ø)
tests/test_webcfgdb.c	85.39% <0.00%> (ø)
tests/webcfgCli.c	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes