style: add recommended mocha rules

[tpluscode]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.99%. Comparing base (35c8837) to head (a68d34e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1555      +/-   ##
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+ Coverage   73.96%   73.99%   +0.02%     
==========================================
  Files         222      222              
  Lines       15078    15093      +15     
  Branches      891      891              
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+ Hits        11153    11168      +15     
  Misses       3917     3917              
  Partials        8        8              

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[giacomociti]

just curious why mocha recommends using function and not arrow functions. I guess it's to make available some test utilities (like timeout)?

[tpluscode]

just curious why mocha recommends using function and not arrow functions. I guess it's to make available some test utilities (like timeout)?

Correct. I was surprised too. They say

Passing arrow functions (aka “lambdas”) to Mocha is discouraged. Lambdas lexically bind this and cannot access the Mocha context.