Bugfix + unit testing framework

[lpascal-ledger]

No description provided.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@7914ec2). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #27   +/-   ##
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  Coverage          ?   72.15%           
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  Files             ?        2           
  Lines             ?       79           
  Branches          ?        0           
=========================================
  Hits              ?       57           
  Misses            ?       22           
  Partials          ?        0           

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[lpascal-ledger]

To merge after this PR to keep the diff tiny and readable.