Update SelectPanel2 tests from Jest to Vitest

[Copilot]

This PR migrates the SelectPanel2 test suite from Jest to Vitest as part of the broader effort to modernize our testing infrastructure.

Changes Made

Configuration Updates

• Updated vitest.config.browser.mts: Changed the include pattern from a specific file (SelectPanelLoading.test.tsx) to include all SelectPanel2 tests (src/experimental/SelectPanel2/**/*.test.?(c|m)[jt]s?(x))
• Updated jest.config.js: Added the entire SelectPanel2 directory to modulePathIgnorePatterns to exclude it from Jest runs

Test Migration

• Migrated SelectPanel.test.tsx from Jest to Vitest syntax:
  • Added describe, expect, it, vi imports from vitest
  • Replaced all jest.fn() calls with vi.fn()
  • Replaced all jest.spyOn() calls with vi.spyOn()
  • Removed manual matchMedia mock setup (Vitest handles browser APIs differently)

Validation

• ✅ All 13 tests pass under Vitest (11 in SelectPanel.test.tsx + 2 in SelectPanelLoading.test.tsx)
• ✅ Jest no longer runs SelectPanel2 tests (properly excluded)
• ✅ No linting errors
• ✅ Files formatted with Prettier

The migration maintains full test coverage while following the established patterns from other migrated components like Banner.

Fixes #6386.

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[changeset-bot]

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Latest commit: 05cb1c0

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[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	92.21 KB (-0.13% 🔽)
packages/react/dist/browser.umd.js	92.39 KB (-0.1% 🔽)

[Copilot]

Pull Request Overview

This PR migrates the SelectPanel2 test suite from Jest to Vitest as part of modernizing the testing infrastructure. The migration ensures all SelectPanel2 tests run under Vitest while being properly excluded from Jest.

• Updated Vitest configuration to include all SelectPanel2 tests instead of just one specific file
• Migrated SelectPanel.test.tsx from Jest to Vitest syntax by replacing Jest functions with Vitest equivalents
• Updated Jest configuration to exclude the entire SelectPanel2 directory from Jest runs

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/react/vitest.config.browser.mts	Expanded include pattern to cover all SelectPanel2 tests
packages/react/src/experimental/SelectPanel2/SelectPanel.test.tsx	Migrated test syntax from Jest to Vitest
packages/react/jest.config.js	Added SelectPanel2 directory to Jest ignore patterns

Comments suppressed due to low confidence (1)

packages/react/src/experimental/SelectPanel2/SelectPanel.test.tsx:117

• The function selectUnselectedOption is being called without await on lines 127, 141, 155, and 187, but it's defined as an async function. This will cause the function to return a Promise that isn't being awaited, potentially leading to timing issues in tests.

  const selectUnselectedOption = async (container: RenderResult, user: UserEvent) => {