👷 Migrate unit tests to Vitest

[rgaignault]

Summary

This replaces the Karma unit test setup with Vitest Browser Mode and updates local testing, CI, coverage, and BrowserStack execution accordingly.

Testing

• yarn test:unit --seed 123
• yarn lint

[datadog-datadog-prod-us1-2]

 

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⚠️ Warnings

🚦 5 Pipeline jobs failed

DataDog/browser-sdk | check-staging-merge     

DataDog/browser-sdk | unit-bs: [firefox]     

DataDog/browser-sdk | unit-bs: [chrome-desktop]     

View all 5 failed jobs.

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 62.76%
• Overall Coverage: 74.01% (-3.23%)

Useful? React with 👍 / 👎

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[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	178.22 KiB	178.22 KiB	0 B	0.00%	✅
Rum Profiler	8.22 KiB	8.22 KiB	0 B	0.00%	✅
Rum Recorder	21.12 KiB	21.12 KiB	0 B	0.00%	✅
Logs	55.53 KiB	55.53 KiB	0 B	0.00%	✅
Rum Slim	136.28 KiB	136.28 KiB	0 B	0.00%	✅
Worker	22.96 KiB	22.96 KiB	0 B	0.00%	✅