WIP: test: improve coverage

[popomore]

Checklist

• [ ] npm test passes
• [ ] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [ ] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov[bot]]

Codecov Report

Merging #52 into master will increase coverage by 0.78%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
+ Coverage   93.89%   94.68%   +0.78%     
==========================================
  Files           9        9              
  Lines         508      508              
==========================================
+ Hits          477      481       +4     
+ Misses         31       27       -4

Impacted Files	Coverage Δ
lib/prerequire.js	100% <ø> (+10%)	:arrow_up:
lib/app.js	100% <100%> (+0.72%)	:arrow_up:
lib/cluster.js	93.93% <100%> (+1.93%)	:arrow_up:

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