Core: Track test provider state in sessionStorage

[ghengeveld]

Keeps state for the Testing Module in sessionStorage so that it survives browser refreshes and stays in sync with story statuses (which are also kept in sessionStorage).

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/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>

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buildSize	6.87 MB	6.87 MB	198 B	1.01	0%
buildSbAddonsSize	1.51 MB	1.51 MB	0 B	0.92	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	1.9 MB	1.9 MB	198 B	1.01	0%
buildSbPreviewSize	271 kB	271 kB	0 B	-	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	3.88 MB	3.88 MB	198 B	1.01	0%
buildPreviewSize	3 MB	3 MB	0 B	-	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	22.1s	13.6s	-8s -485ms	-0.03	-62.3%
generateTime	19.4s	25.6s	6.1s	1.42	🔺24.1%
initTime	13.7s	17.6s	3.9s	0.92	22.1%
buildTime	8.9s	7.7s	-1s -239ms	-1.78	🔰-16.1%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	6.6s	7.3s	651ms	0.37	8.9%
devManagerResponsive	4.2s	4.4s	198ms	0	4.4%
devManagerHeaderVisible	593ms	770ms	177ms	1.12	23%
devManagerIndexVisible	621ms	852ms	231ms	1.09	27.1%
devStoryVisibleUncached	1.2s	1.4s	215ms	1.06	14.4%
devStoryVisible	620ms	847ms	227ms	1.09	26.8%
devAutodocsVisible	541ms	645ms	104ms	0.41	16.1%
devMDXVisible	593ms	622ms	29ms	0.3	4.7%
buildManagerHeaderVisible	667ms	669ms	2ms	0.44	0.3%
buildManagerIndexVisible	696ms	684ms	-12ms	0.39	-1.8%
buildStoryVisible	669ms	668ms	-1ms	0.44	-0.1%
buildAutodocsVisible	518ms	617ms	99ms	0.97	16%
buildMDXVisible	495ms	489ms	-6ms	-0.39	-1.2%

Greptile Summary

Added sessionStorage persistence for the Testing Module state in the Storybook sidebar to maintain test provider state across browser refreshes and sync with story statuses.

• Added sessionStorage initialization in SidebarBottom.tsx using STORAGE_KEY = '@storybook/manager/test-providers'
• Implemented state persistence through updateTestProvider callback that updates both React state and sessionStorage
• Added storage cleanup in clearState function when tests are rerun
• Added error handling for JSON parsing of stored state during initialization

[greptile-apps]

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