Build: Fix tests by adding formatted diff comparison

[ndelangen]

What I did

The getDiff was inconsistent due to different formatting, by adding explicit formatting, this should be solved

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

Not 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>

Summary by CodeRabbit

• Tests

  • Improved Metro configuration codemod tests to normalize source formatting before diff/snapshot comparisons, making assertions more robust and consistent.

• Refactor

  • Standardized diff/snapshot validation across Metro config tests by consolidating formatting and comparison helpers for clearer, more maintainable tests.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: c7e0fb39-c09f-477c-84df-b6e8306f82be

📥 Commits

Reviewing files that changed from the base of the PR and between 0293537 and cf431f3.

📒 Files selected for processing (1)

• code/lib/create-storybook/src/generators/REACT_NATIVE/metroConfig.test.ts

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📝 Walkthrough

Walkthrough

Replaced raw diff assertions in Metro config codemod tests with a new getFormattedDiff(before, after, filePath) helper that uses oxfmt.format (single-quote filename-based formatting) before calling getDiff. Multiple inline snapshot expectations updated to match the normalized formatted diffs.

Changes

Metro Config Test — oxfmt Normalized Diffs

Layer / File(s)	Summary
Formatting helper code/lib/create-storybook/src/generators/REACT_NATIVE/metroConfig.test.ts	Added oxfmt.format import and new getFormattedDiff(before, after, filePath) that formats both inputs (single-quote style using path.basename(filePath)) then calls getDiff.
Test assertions code/lib/create-storybook/src/generators/REACT_NATIVE/metroConfig.test.ts	Updated multiple tests (wrap module.exports, wrap existing wrapper, ESM import wrapper, template-literal import case, TypeScript return/type-parameter preservation, etc.) to use await getFormattedDiff(...) and updated inline snapshot diffs to match formatted output.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• storybookjs/storybook#34660: Modifies the same metroConfig.test.ts suite; changes are directly related to the codemod test expectations.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
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[Copilot]

Pull request overview

This PR stabilizes metroConfig codemod test snapshots by normalizing before/after sources with Prettier prior to generating the textual diff, avoiding failures caused purely by formatting differences.

Changes:

• Add a getFormattedDiff() helper that formats both inputs via prettier.format({ filepath }) before calling getDiff.
• Update several inline snapshot assertions to compare formatted diffs.
• Make a few test cases async and reuse a consistent filePath variable for formatting inference.

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