test(evm-api-worker): increase 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 97.74%. Comparing base (fe6f3b9) to head (6806d11).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1319       +/-   ##
============================================
+ Coverage    55.81%   97.74%   +41.93%     
============================================
  Files          967        4      -963     
  Lines        64426      444    -63982     
  Branches      1580       82     -1498     
============================================
- Hits         35960      434    -35526     
+ Misses       28237        8    -28229     
+ Partials       229        2      -227     

Flag	Coverage Δ
contracts	97.74% <ø> (?)
packages	?

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