import { describe, it, expect } from 'vitest'
import { cn } from './utils'

describe('cn', () => {
  it('merges class names', () => {
    expect(cn('foo', 'bar')).toBe('foo bar')
  })

  it('handles conditional classes', () => {
    const isHidden = false
    expect(cn('base', isHidden && 'hidden', 'visible')).toBe('base visible')
  })

  it('deduplicates tailwind classes', () => {
    expect(cn('p-4', 'p-2')).toBe('p-2')
  })

  it('handles undefined and null', () => {
    expect(cn('foo', undefined, null, 'bar')).toBe('foo bar')
  })

  it('handles empty inputs', () => {
    expect(cn()).toBe('')
  })

  it('merges conflicting tailwind utilities', () => {
    expect(cn('text-red-500', 'text-blue-500')).toBe('text-blue-500')
  })
})