pc: add error test cases to PCD unmarshal

[at-wat]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.26%. Comparing base (91d7723) to head (8c48dc8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   84.23%   86.26%   +2.02%     
==========================================
  Files          33       33              
  Lines        1922     1922              
==========================================
+ Hits         1619     1658      +39     
+ Misses        232      206      -26     
+ Partials       71       58      -13     

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