Addon Test: Clear coverage data when starting or watching

[ghengeveld]

Supersedes #30062

What I did

This clears the coverage data when starting a new test run or enabling watch mode, in order to prevent stale coverage data from lingering.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

name	before	after	diff	z	%
createSize	0 B	0 B	0 B	-	-
generateSize	77.7 MB	77.7 MB	0 B	1.11	0%
initSize	136 MB	136 MB	0 B	1.11	0%
diffSize	58.4 MB	58.4 MB	0 B	1.11	0%
buildSize	7.24 MB	7.24 MB	0 B	0.9	0%
buildSbAddonsSize	1.88 MB	1.88 MB	0 B	0.9	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	1.86 MB	1.86 MB	0 B	0.83	0%
buildSbPreviewSize	0 B	0 B	0 B	-	-
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	3.93 MB	3.93 MB	0 B	0.9	0%
buildPreviewSize	3.3 MB	3.3 MB	0 B	0.89	0%
testBuildSize	0 B	0 B	0 B	-	-
testBuildSbAddonsSize	0 B	0 B	0 B	-	-
testBuildSbCommonSize	0 B	0 B	0 B	-	-
testBuildSbManagerSize	0 B	0 B	0 B	-	-
testBuildSbPreviewSize	0 B	0 B	0 B	-	-
testBuildStaticSize	0 B	0 B	0 B	-	-
testBuildPrebuildSize	0 B	0 B	0 B	-	-
testBuildPreviewSize	0 B	0 B	0 B	-	-

name	before	after	diff	z	%
createTime	8s	25.5s	17.4s	1.37	🔺68.5%
generateTime	20.2s	21.7s	1.5s	1.11	7%
initTime	14.5s	15.4s	878ms	0.96	5.7%
buildTime	11.9s	10.7s	-1s -114ms	0.71	-10.3%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	5.6s	4.8s	-824ms	-0.52	-17.1%
devManagerResponsive	4.1s	3.5s	-615ms	-0.71	-17.3%
devManagerHeaderVisible	748ms	667ms	-81ms	0.92	-12.1%
devManagerIndexVisible	770ms	702ms	-68ms	0.75	-9.7%
devStoryVisibleUncached	1.9s	1.8s	-133ms	0.24	-7.2%
devStoryVisible	792ms	703ms	-89ms	0.72	-12.7%
devAutodocsVisible	501ms	605ms	104ms	1.41	🔺17.2%
devMDXVisible	578ms	637ms	59ms	1.34	🔺9.3%
buildManagerHeaderVisible	642ms	660ms	18ms	0.94	2.7%
buildManagerIndexVisible	744ms	788ms	44ms	1.24	🔺5.6%
buildStoryVisible	603ms	593ms	-10ms	0.71	-1.7%
buildAutodocsVisible	504ms	577ms	73ms	2.51	🔺12.7%
buildMDXVisible	475ms	564ms	89ms	1.69	🔺15.8%

Greptile Summary

Based on the provided files and changes, I'll create a concise summary of this PR:

This PR enhances the test addon to clear coverage data when starting new test runs or enabling watch mode, preventing stale coverage information from persisting between test sessions.

• Modified code/addons/test/src/manager.tsx to properly clear coverage data on test start/watch
• Updated test coverage documentation in docs/writing-tests/test-coverage.mdx with Vitest 3.0.0 references
• Added Vite dependency optimization for test packages in test-storybooks/portable-stories-kitchen-sink/react/.storybook/main.ts
• Improved error handling in scripts/task.ts with helpful task name suggestions
• Added useLegacyCache: "true" to code/nx.json for build system compatibility

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[greptile-apps]

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