Add cwt test

[dajiaji]

No description provided.

[codecov]

Codecov Report

Merging #29 (507165c) into main (b451639) will increase coverage by 2.53%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   88.47%   91.00%   +2.53%     
==========================================
  Files          13       13              
  Lines         746      745       -1     
  Branches      172      171       -1     
==========================================
+ Hits          660      678      +18     
+ Misses         56       46      -10     
+ Partials       30       21       -9     

Impacted Files	Coverage Δ
cwt/cose.py	59.75% <100.00%> (+2.43%)	⬆️
cwt/cwt.py	100.00% <100.00%> (+10.94%)	⬆️
cwt/cbor_processor.py	85.71% <0.00%> (+14.28%)	⬆️

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