test: avoid infinite loop with React 19 and StrictMode

[dai-shi]

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Fixes #2931

• show the working pattern as tests

Summary

Check List

• pnpm run fix:format for formatting code and docs

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commit: deabc9d

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Size Change: 0 B

Total Size: 92.1 kB

ℹ️ View Unchanged

Filename	Size
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./dist/umd/vanilla.production.js	2.85 kB
./dist/umd/vanilla/utils.development.js	6.25 kB
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./dist/utils.js	247 B
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./dist/vanilla/utils.js	6.11 kB

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