Nuxt/test/nuxt/components.test.ts

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/// <reference path="../fixtures/basic/.nuxt/nuxt.d.ts" />
import { describe, expect, it, vi } from 'vitest'
import { mountSuspended } from '@nuxt/test-utils/runtime'
import { nuxtLinkDefaults } from '#build/nuxt.config.mjs'
describe('nuxt-link:prefetch', () => {
it('should prefetch on visibility by default', async () => {
const component = defineNuxtLink(nuxtLinkDefaults)
const { observer } = useMockObserver()
const nuxtApp = useNuxtApp()
nuxtApp.hooks.callHook = vi.fn(() => Promise.resolve())
await mountSuspended(component, { props: { to: '/to' } })
expect(nuxtApp.hooks.callHook).not.toHaveBeenCalled()
await observer.trigger()
expect(nuxtApp.hooks.callHook).toHaveBeenCalledTimes(1)
await observer.trigger()
expect(nuxtApp.hooks.callHook).toHaveBeenCalledTimes(1)
})
it('should prefetch with custom string `prefetchOn`', async () => {
const component = defineNuxtLink(nuxtLinkDefaults)
const nuxtApp = useNuxtApp()
nuxtApp.hooks.callHook = vi.fn(() => Promise.resolve())
const { observer } = useMockObserver()
const wrapper = await mountSuspended(component, { props: { to: '/to', prefetchOn: 'interaction' } })
await observer.trigger()
expect(nuxtApp.hooks.callHook).not.toHaveBeenCalled()
await wrapper.find('a').trigger('focus')
expect(nuxtApp.hooks.callHook).toHaveBeenCalledTimes(1)
await wrapper.find('a').trigger('focus')
expect(nuxtApp.hooks.callHook).toHaveBeenCalledTimes(1)
await wrapper.find('a').trigger('pointerenter')
expect(nuxtApp.hooks.callHook).toHaveBeenCalledTimes(1)
})
it('should prefetch with custom object `prefetchOn`', async () => {
const component = defineNuxtLink(nuxtLinkDefaults)
const nuxtApp = useNuxtApp()
nuxtApp.hooks.callHook = vi.fn(() => Promise.resolve())
const { observer } = useMockObserver()
await mountSuspended(component, { props: { to: '/to', prefetchOn: { interaction: true } } })
await observer.trigger()
expect(nuxtApp.hooks.callHook).toHaveBeenCalled()
})
it('should prefetch with custom object `prefetchOn` overriding default', async () => {
const component = defineNuxtLink(nuxtLinkDefaults)
const nuxtApp = useNuxtApp()
nuxtApp.hooks.callHook = vi.fn(() => Promise.resolve())
const { observer } = useMockObserver()
await mountSuspended(component, { props: { to: '/to', prefetchOn: { interaction: true, visibility: false } } })
await observer.trigger()
expect(nuxtApp.hooks.callHook).not.toHaveBeenCalled()
})
})
function useMockObserver () {
let callback: (entries: Array<{ target: HTMLElement, isIntersecting: boolean }>) => unknown
let el: HTMLElement
const mockObserver = class IntersectionObserver {
el: HTMLElement
constructor (_callback?: (entries: Array<{ target: HTMLElement, isIntersecting: boolean }>) => unknown) {
callback ||= _callback
}
observe = (_el: HTMLElement) => { el = _el }
trigger = () => callback?.([{ target: el, isIntersecting: true }])
unobserve = () => {}
disconnect = () => {}
}
window.IntersectionObserver = mockObserver as any
const observer = new mockObserver()
return { observer }
}