import { test, expect, beforeAll } from 'vitest'
function resetDocument() {
globalThis.localStorage = {
getItem: () => undefined,
setItem: () => {}
} as any
document.documentElement.innerHTML = `
`
}
beforeAll(() => {
resetDocument()
})
test('data-theme attribute is set as quickly as possible', async () => {
globalThis.localStorage = {
getItem: () => 'dark', // or 'dark'/'light' to simulate saved theme
setItem: () => {}
} as any
globalThis.window.matchMedia = () =>
({ matches: true, addEventListener: () => {} }) as any
await import('./theme.cjs')
// Check the data-theme attribute
const htmlEl = document.querySelector('html')
expect(htmlEl?.getAttribute('data-theme')).toBe('dark') // or 'light'
})
test('data-theme attribute is set based on localStorage', async () => {
globalThis.localStorage = {
getItem: () => 'dark',
setItem: () => {}
} as any
await import('./theme.cjs')
const htmlEl = document.querySelector('html')
expect(htmlEl?.getAttribute('data-theme')).toBe('dark')
})
test('data-theme attribute is set based on system preference', async () => {
globalThis.window.matchMedia = () =>
({ matches: true, addEventListener: () => {} }) as any
await import('./theme.cjs')
const htmlEl = document.querySelector('html')
expect(htmlEl?.getAttribute('data-theme')).toBe('dark')
})
test('data-theme attribute changes on system preference change', async () => {
let changeCallback: any = () => {}
globalThis.window.matchMedia = () =>
({
matches: false,
addEventListener: (_: any, callback: any) => {
changeCallback = callback
}
}) as any
await import('./theme.cjs')
// Simulate a system preference change
changeCallback({ matches: true })
const htmlEl = document.querySelector('html')
expect(htmlEl?.getAttribute('data-theme')).toBe('dark')
})
test('meta tags are updated', async () => {
globalThis.window.matchMedia = () =>
({ matches: true, addEventListener: () => {} }) as any
await import('./theme.cjs')
const metaThemeColor = document.querySelector('meta[name=theme-color]')
const metaThemeColorMs = document.querySelector(
'meta[name=msapplication-TileColor]'
)
expect(metaThemeColor?.getAttribute('content')).toBe('#1d2224')
expect(metaThemeColorMs?.getAttribute('content')).toBe('#1d2224')
})
test('sun and moon hidden attributes are updated', async () => {
globalThis.window.matchMedia = () =>
({ matches: true, addEventListener: () => {} }) as any
await import('./theme.cjs')
const sun = document.querySelector('#sun')
const moon = document.querySelector('#moon')
expect(sun?.hasAttribute('hidden')).toBe(false)
expect(moon?.hasAttribute('hidden')).toBe(true)
})