Add tests for certain sync features

[wilwong89]

Description

Tests written for version.spec.js, utils.spec.js and sync.spec.js Cleaned up some linting warnings for all other files

Types of changes

New feature (non-breaking change which adds functionality)

Checklist

• [X] I have read the CONTRIBUTING doc
• [X] I have checked that unit tests pass locally with my changes
• [X] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)

Further comments

[codeclimate[bot]]

Code Climate has analyzed commit 479b849b and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 65.6% (0.8% change).

View more on Code Climate.

[github-actions[bot]]

Coverage Report

Totals
Statements:	59% ( 2703 / 4581 )
Methods:	49.04% ( 307 / 626 )
Lines:	65.6% ( 1621 / 2471 )
Branches:	52.22% ( 775 / 1484 )