Update lint rules, force testify/assert for tests

[Sean-Der]

Use testify's assert package instead of the standard library's testing package.

Description

Reference issue

Fixes #...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.39%. Comparing base (f627aed) to head (651ff3d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #69   +/-   ##
=======================================
  Coverage   70.39%   70.39%           
=======================================
  Files           8        8           
  Lines        1692     1692           
=======================================
  Hits         1191     1191           
  Misses        475      475           
  Partials       26       26           

Flag	Coverage Δ
go	70.39% <ø> (ø)
wasm	69.03% <ø> (ø)

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