test: Improve testing of events parsing.

[iphydf]

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Codecov Report

❌ Patch coverage is 99.34641% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.50%. Comparing base (a9c67bf) to head (06fae39).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/api/toxcore/tox_events.dart	99.34%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #93       +/-   ##
===========================================
+ Coverage   48.20%   77.50%   +29.30%     
===========================================
  Files          62       62               
  Lines        2672     2516      -156     
===========================================
+ Hits         1288     1950      +662     
+ Misses       1384      566      -818     

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