test(crypto-messages): add extra unit tests

[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 62.16%. Comparing base (bad6156) to head (caa3b7e).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1395      +/-   ##
===========================================
+ Coverage    61.08%   62.16%   +1.07%     
===========================================
  Files          927      931       +4     
  Lines        14947    15390     +443     
  Branches      1661     1742      +81     
===========================================
+ Hits          9131     9567     +436     
- Misses        5811     5816       +5     
- Partials         5        7       +2     

Flag	Coverage Δ
contracts	97.74% <ø> (?)
packages	61.10% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.