tests: check tx processing on metadata updates

[r4mmer]

Acceptance Criteria

• Check that when a metadata update event is received the history is processed correctly.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.77%. Comparing base (c184bbd) to head (8748bf5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #812   +/-   ##
=======================================
  Coverage   80.77%   80.77%           
=======================================
  Files          86       86           
  Lines        6594     6594           
  Branches     1420     1430   +10     
=======================================
  Hits         5326     5326           
  Misses       1255     1255           
  Partials       13       13           

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