Expand the write_labels tests to make sure read_labels can read labels written by write_labels

[anujanegi]

Fixes #68.

[marco-c]

The test is failing, so you will have to change it a bit.
Make the label object more close to the actual one we are storing with labels.py (keys are strings, values are strings).

[marco-c]

Actually, marking as "changes requested" until the tests are passing.

[codecov-io]

Codecov Report

Merging #165 into master will increase coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #165      +/-   ##
=========================================
+ Coverage   24.51%   24.6%   +0.09%     
=========================================
  Files          11      11              
  Lines         820     821       +1     
  Branches       97      97              
=========================================
+ Hits          201     202       +1     
  Misses        617     617              
  Partials        2       2

Impacted Files	Coverage Δ
tests/test_utils.py	100% <100%> (ø)	⬆️

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[propr]

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