Build: Refactor tests for windows

[ndelangen]

What I did

The tests I added for RN were not platform agnostic, so they failed on windows, this solves that problem.

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

I do not think it's needed.

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 publish.yml --field pr=<PR_NUMBER>

[Copilot]

Pull request overview

This PR makes recently added React Native and eval tests platform-agnostic so they pass on Windows as well as POSIX environments. It fits into the repo’s cross-platform test stability work by removing path-separator assumptions from assertions.

Changes:

• Updated a prompt-loading test to accept either / or \ in the expected dispatcher path.
• Added a small path-normalization helper in the React Native entrypoint tests.
• Normalized path.relative(...) results before snapshot assertions so snapshots remain stable across platforms.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
scripts/eval/lib/utils.test.ts	Makes the prompt path assertion accept Windows and POSIX separators.
code/lib/create-storybook/src/generators/REACT_NATIVE/generateEntrypoint.test.ts	Normalizes relative paths before snapshot checks in RN entrypoint tests.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 93423287-3f55-4826-b09f-f4fad1454236

📥 Commits

Reviewing files that changed from the base of the PR and between 1d84ef6 and 0eddec2.

📒 Files selected for processing (2)

• code/lib/create-storybook/src/generators/REACT_NATIVE/generateEntrypoint.test.ts
• scripts/eval/lib/utils.test.ts

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📝 Walkthrough

Walkthrough

The PR updates test code to handle cross-platform path separators, making snapshot assertions and path-matching regex patterns insensitive to OS differences. A normalizePath helper is added to normalize Windows backslashes to forward slashes in React Native tests, and a regex is updated in eval utils tests to accept either separator style.

Changes

Cross-Platform Test Path Normalization

Layer / File(s)	Summary
Path Normalization Helper code/lib/create-storybook/src/generators/REACT_NATIVE/generateEntrypoint.test.ts	Added local normalizePath helper that converts OS-specific path separators to forward slashes.
Snapshot Assertions code/lib/create-storybook/src/generators/REACT_NATIVE/generateEntrypoint.test.ts	Applied normalizePath to path.relative() calls in three inline snapshot assertions (TypeScript, JavaScript, and Expo variants) to handle Windows backslashes.
Regex Path Matching scripts/eval/lib/utils.test.ts	Updated regex pattern in loadPrompt test to accept both POSIX (/) and Windows (\) directory separators when matching the dispatcher.js command path.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• storybookjs/storybook#33644: Makes test code platform-agnostic by normalizing file paths to handle Windows separators.
• storybookjs/storybook#34663: Updates the same React Native entrypoint generation test file to normalize path separators in snapshot assertions.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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