Setup Tests, Coverage & CI ; update tooling.

[nim65s]

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@fb17a87). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #7   +/-   ##
=========================================
  Coverage          ?   95.08%           
=========================================
  Files             ?        1           
  Lines             ?       61           
  Branches          ?        0           
=========================================
  Hits              ?       58           
  Misses            ?        3           
  Partials          ?        0           

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