code cleanup and more unit tests

[codecov[bot]]

Codecov Report

Merging #67 (3465f0b) into main (ed18118) will increase coverage by 0.72%. The diff coverage is 32.09%.

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
+ Coverage   48.96%   49.69%   +0.72%     
==========================================
  Files          33       33              
  Lines         968      974       +6     
==========================================
+ Hits          474      484      +10     
+ Misses        494      490       -4     

Impacted Files	Coverage Δ
src/meeple/command/update.py	25.00% <0.00%> (ø)
src/meeple/util/cmd_util.py	100.00% <ø> (ø)
src/meeple/command/collections.py	35.13% <10.00%> (ø)
src/meeple/util/api_util.py	43.75% <12.50%> (+1.32%)	:arrow_up:
src/meeple/util/data_util.py	35.18% <16.66%> (+1.25%)	:arrow_up:
src/meeple/util/collection_util.py	34.42% <26.66%> (+0.58%)	:arrow_up:
src/meeple/command/open.py	50.00% <33.33%> (+2.38%)	:arrow_up:
src/meeple/command/find.py	31.34% <50.00%> (ø)
src/meeple/util/fs_util.py	75.00% <57.89%> (-25.00%)	:arrow_down:
src/meeple/__init__.py	100.00% <100.00%> (ø)
... and 1 more

... and 2 files with indirect coverage changes

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