test: add tests for gitUtils

[Josh-Cena]

Motivation

Added some basic tests so this file is at least test-covered.

Have you read the Contributing Guidelines on pull requests?

Yes

[Josh-Cena]

/cc @felipecrs Currently the git utils seem to use the committer date. I think when you originally implemented it, you mentioned we should use the author date instead? I think that's a certainly valid idea.

[Josh-Cena]

Oh, read your reasoning in #6593. Honestly, continuously amending a commit doesn't sound like a terribly common practice, but I'm fine with this way.

[netlify]

✅ [V2]

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	57
🟢 Accessibility	100
🟢 Best practices	92
🟢 SEO	100
🟢 PWA	90

Lighthouse ran on https://deploy-preview-6949--docusaurus-2.netlify.app/

[github-actions]

Size Change: 0 B

Total Size: 805 kB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	49.9 kB
website/build/assets/css/styles.********.css	105 kB
website/build/assets/js/main.********.js	612 kB
website/build/index.html	38.8 kB

_{compressed-size-action}

[Josh-Cena]

Oops, forgot to check Windows status again...

[felipecrs]

The tests turned out great, by the way. :)