[zatteo]

Summary

• Move the unit vitest project of twake-mui into its own vitest.unit.config.ts. npm test now runs it alone. vitest run --project unit still loaded vitest.config.ts, along with the storybook, argos and playwright plugins that the unit tests never use. vitest.config.ts lists the new file next to the storybook project, so npm run screenshots is unchanged.
• Turn off per-file isolation for the unit project. Re-importing MUI for each of the 17 test files cost more than the tests themselves. The files pass in any order: 5 shuffled runs with 4 workers, 2 with 1 worker, plus 6 shuffle seeds during the earlier study.
• Ask actions/setup-node to cache npm downloads (cache: 'npm') in the three CI/CD jobs, as argos.yml already does. Today npm ci takes 17–44 s.

Measures

Docker container with 4 CPU and 16 GB, like ubuntu-latest. Median of 3 paired runs of npm test --workspace=@linagora/twake-mui:

	Before	After
Wall time	4.3 s	2.3 s (0.51×)
CPU time	12.2 s	6.9 s
Test files / tests	17 / 123	17 / 123

The npm cache gain will show from the second run onwards, once a cache entry exists for the lockfile.

Test plan

• npm run lint, npm run lint:fmt, npm run build
• npm test: same 17 files and 123 tests, also with shuffled file order
• vitest list --project storybook still finds the stories through vitest.config.ts
• CI green, including the React 18 job

🤖 Generated with Claude Code

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