Refactor encoding test + partial verification of #22

[isoos]

#22

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b4d97fb) 85.77% compared to head (2a0e7dd) 85.74%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
lib/src/messages/client_messages.dart	80.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #264      +/-   ##
==========================================
- Coverage   85.77%   85.74%   -0.04%     
==========================================
  Files          25       25              
  Lines        2215     2216       +1     
==========================================
  Hits         1900     1900              
- Misses        315      316       +1     

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