[RFC] Add comprehensive tests for Command component

[AlexZander-666]

Feature description

RFC: Add comprehensive tests for Command component

🎯 Motivation

The Command component is one of the most widely used components in shadcn/ui, powering command palettes and search interfaces across thousands of projects. However, it currently lacks comprehensive test coverage.

This proposal aims to add a complete test suite to:

• Ensure component reliability across different use cases
• Prevent regressions during future updates
• Serve as documentation for component behavior
• Establish testing patterns for other components

📋 Proposed Test Coverage

Rendering & Structure (8 tests)

• Render Command component
• Render with custom className
• Render children correctly
• Render CommandInput with search icon
• Render CommandList with multiple items
• Render CommandEmpty state
• Render CommandGroup with heading
• Render CommandSeparator

User Interactions (12 tests)

• Accept text input in CommandInput
• Apply custom placeholder
• Handle click events on CommandItem
• Call onSelect callback
• Handle disabled items
• CommandDialog opens when open=true
• CommandDialog closes when open=false
• Call onOpenChange on dialog state change
• Filter items based on search input (cmdk behavior)
• Navigate with keyboard (handled by cmdk)
• Display shortcut hints
• Support multiple command groups

Edge Cases (8 tests)

• Empty command list
• Special characters in items
• Very long item text
• Large number of items (100+)
• Command without input
• Command with only empty state
• Multiple items with same text
• Nested groups

Complex Scenarios (4 tests)

• Complete command palette structure
• Multiple groups with separators
• Items with shortcuts
• Search filtering integration

Component Sub-testing (16 tests)

• CommandInput (4 tests)
• CommandList (2 tests)
• CommandItem (4 tests)
• CommandEmpty (2 tests)
• CommandGroup (3 tests)
• CommandSeparator (2 tests)
• CommandShortcut (2 tests)
• CommandDialog (3 tests)

Total: 48 test cases

🛠️ Implementation Details

Testing Stack

• Framework: Vitest (already used in the project)
• Testing Library: @testing-library/react + @testing-library/user-event
• Utilities: @testing-library/jest-dom for enhanced matchers

Test File Location

apps/www/registry/default/ui/command.test.tsx

Dependencies Required

{
  "@testing-library/react": "^14.0.0",
  "@testing-library/user-event": "^14.5.0",
  "@testing-library/jest-dom": "^6.1.0"
}

🧠 Generation & Review Process

1. Initial generation: Used TestMind (AI-powered testing tool) to analyze component structure and generate comprehensive test scaffolding
2. Manual review: Reviewed every test case for:
   • Accuracy and completeness
   • Alignment with shadcn/ui code style
   • Real-world usage patterns
3. Optimization:
   • Adjusted test data to match realistic scenarios
   • Ensured proper async handling
   • Added edge cases not covered by initial generation
4. Validation: Structured tests for maintainability and clarity

✅ Benefits

For Users

• Confidence: Tests ensure component works as expected
• Documentation: Tests serve as usage examples
• Regression Prevention: Catch breaking changes early

For Maintainers

• Safety: Refactor with confidence
• Quality: Catch bugs before release
• Patterns: Establish testing standards for other components

For Contributors

• Guidance: Clear examples of how to test components
• Standards: Template for adding tests to other components

📊 Expected Outcomes

• ✅ 48 comprehensive test cases
• ✅ Coverage of all component variants
• ✅ Edge case handling validated
• ✅ CI/CD integration ready
• ✅ Zero breaking changes to existing code

🤝 Seeking Feedback

Before submitting a PR, I'd love to get feedback on:

1. Scope: Is this level of testing appropriate? Should I add/remove any scenarios?
2. Approach: Are there specific testing patterns shadcn/ui prefers?
3. Dependencies: Are the chosen testing libraries acceptable?
4. Structure: Any preferences for test organization?

🚀 Next Steps

If this proposal is accepted:

1. Submit PR with test suite
2. Address review feedback
3. Potentially create tests for other complex components (Combobox, Calendar, etc.)
4. Document testing best practices for contributors

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Note: This contribution is created with AI assistance (TestMind) but includes thorough human review and optimization to ensure quality and alignment with project standards.

cc @shadcn

Affected component/components

Command

Additional Context

Additional details here...

Before submitting

• I've made research efforts and searched the documentation
• I've searched for existing issues and PRs