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import { beforeEach, describe, expect, it, vi } from 'vitest'
import { applyTheme, normalizeTheme, readTheme, resolveTheme, THEME_STORAGE_KEY } from '@/lib/theme/theme'
describe('theme', () => {
beforeEach(() => {
localStorage.clear()
document.documentElement.className = ''
})
it('normalizes and restores only supported values', () => {
expect(normalizeTheme('dark')).toBe('dark')
expect(normalizeTheme('sepia')).toBeNull()
expect(readTheme()).toBe('system')
localStorage.setItem(THEME_STORAGE_KEY, 'light')
expect(readTheme()).toBe('light')
})
it('resolves system preference and applies semantic root state', () => {
vi.spyOn(window, 'matchMedia').mockReturnValue({
matches: true,
addEventListener: () => {},
removeEventListener: () => {},
} as unknown as MediaQueryList)
expect(resolveTheme('system')).toBe('dark')
expect(applyTheme('system')).toBe('dark')
expect(document.documentElement).toHaveClass('dark')
expect(document.documentElement.style.colorScheme).toBe('dark')
})
})