generate test.js underneath a test directory

[jackcmeyer]

closes #141

• generates test.js in the test/ directory
• updates relevant tests.

[codecov]

Codecov Report

Merging #155 into dev will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev     #155      +/-   ##
==========================================
+ Coverage   76.29%   76.35%   +0.05%     
==========================================
  Files          18       18              
  Lines         443      444       +1     
==========================================
+ Hits          338      339       +1     
  Misses        105      105

Impacted Files	Coverage Δ
src/services/mocha-service.js	100% <100%> (ø)	⬆️

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