test: unit tests for generator

[clarkdo]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-io]

Codecov Report

Merging #4857 into dev will increase coverage by 0.38%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev    #4857      +/-   ##
==========================================
+ Coverage   91.27%   91.66%   +0.38%     
==========================================
  Files          72       72              
  Lines        2395     2399       +4     
  Branches      592      592              
==========================================
+ Hits         2186     2199      +13     
+ Misses        191      182       -9     
  Partials       18       18

Impacted Files	Coverage Δ
packages/generator/src/generator.js	100% <100%> (+8.57%)	⬆️

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