Add test for error handling on encoding/decoding.

[dajiaji]

No description provided.

[codecov]

Codecov Report

Merging #67 (1f899c8) into main (5af43ed) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
+ Coverage   99.32%   99.46%   +0.13%     
==========================================
  Files          17       17              
  Lines        1477     1483       +6     
  Branches      370      371       +1     
==========================================
+ Hits         1467     1475       +8     
+ Misses          8        6       -2     
  Partials        2        2              

Impacted Files	Coverage Δ
cwt/cbor_processor.py	100.00% <100.00%> (+14.28%)	⬆️
cwt/cose.py	100.00% <100.00%> (ø)
cwt/cwt.py	100.00% <100.00%> (ø)

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