test(crypto-key-pair-ecdsa): increate unit test coverage

[sebastijankuzner]

Summary

Checklist

• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.23%. Comparing base (b2a25b6) to head (3c20e1b).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1214      +/-   ##
===========================================
+ Coverage    52.84%   53.23%   +0.39%     
===========================================
  Files         1117     1120       +3     
  Lines        61771    62201     +430     
  Branches      1674     1753      +79     
===========================================
+ Hits         32642    33113     +471     
+ Misses       28975    28932      -43     
- Partials       154      156       +2     

Flag	Coverage Δ
contracts	98.60% <ø> (?)
packages	52.91% <100.00%> (+0.07%)	⬆️

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