refactor: update tests from Jest to Vitest

[joshblack]

Part of: https://github.com/github/primer/issues/5336

Changelog

New

Changed

• Update test files from Jest to Vitest

Removed

Rollout strategy

• None; if selected, include a brief description as to why

[changeset-bot]

⚠️ No Changeset found

Latest commit: dc14a86

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[Copilot]

Pull Request Overview

This PR migrates test files from Jest to Vitest as part of a broader testing framework transition. The changes update test imports, configuration files, and snapshot formats to be compatible with Vitest while maintaining the same test functionality.

Key changes include:

• Adding Vitest imports (describe, it, expect) to test files
• Updating Jest configuration and Vitest configuration to include newly migrated test paths
• Converting Jest snapshot format to Vitest snapshot format

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/react/vitest.config.browser.mts	Added test paths for Hidden and deprecated components, reordered existing paths alphabetically
packages/react/jest.config.js	Added corresponding test paths and reordering to match Vitest config
packages/react/src/deprecated/utils/createSlots.test.tsx	Added Vitest imports and reordered React import
packages/react/src/deprecated/utils/snapshots/createSlots.test.tsx.snap	Updated snapshot format from Jest to Vitest
packages/react/src/deprecated/UnderlineNav/UnderlineNavLink.test.tsx	Migrated from custom testing utils to standard testing-library with Vitest imports
packages/react/src/deprecated/UnderlineNav/UnderlineNav.test.tsx	Migrated from custom testing utils to standard testing-library, removed accessibility tests
packages/react/src/Hidden/snapshots/Hidden.test.tsx.snap	Updated snapshot format and class name expectations
packages/react/src/Hidden/Hidden.test.tsx	Simplified test file by removing custom testing utilities and accessibility checks

[Copilot]

The import path '../UnderlineNav' is inconsistent with the original import pattern. It should be 'import {UnderlineNav} from '../../deprecated'' to maintain consistency with the UnderlineNavLink test file and ensure the correct component is imported.

Suggested change

	import UnderlineNav from '../UnderlineNav'
	import {UnderlineNav} from '../../deprecated'

[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	91.9 KB (0%)
packages/react/dist/browser.umd.js	92.23 KB (0%)