refactor: extract tests into separate files

[nickolas-dimitrakas]

Background

• The test suite previously had a large, monolithic test file containing multiple unrelated test cases.
• This made it difficult to locate, maintain, and extend individual tests efficiently.

What Has Changed

• Extracted tests from the large unified file into smaller, focused files grouped by feature or component.

Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have tested this locally.

Reference Issue (For employees only. Ignore if you are an outside contributor)

• Closes https://rokt.atlassian.net/browse/SDKE-477

[denischilik]

LGTM

[mparticle-automation]

🎉 This PR is included in version 9.0.0 🎉

The release is available on GitHub release

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