Improve snippet testing

[MateuszKubuszok]

TODO:

• separate Chimney-specific things from something that could be made a separate library
• use colors to distinct tests results
• test errors
• automate the detection of strategies
  • snippets with pseudocode would contain // this is a pseudocode or similar
  • snippets testing errors should contain // should produce the following error
• turn each .md file into a separate test suite
• allow filtering tests with a simple filter (sth like testOnly)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.60%. Comparing base (c64c690) to head (0344a63).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #524   +/-   ##
=======================================
  Coverage   87.60%   87.60%           
=======================================
  Files         136      136           
  Lines        5488     5488           
  Branches      440      440           
=======================================
  Hits         4808     4808           
  Misses        680      680           

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