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serverPrefetch.spec.js
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serverPrefetch.spec.js
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import Vue from 'vue/dist/vue.common.js'
import { createRenderer } from 'vue-server-renderer'
import { ref, onServerPrefetch, getCurrentInstance } from '../../src'
function fetch(result) {
return new Promise((resolve) => {
setTimeout(() => {
resolve(result)
}, 10)
})
}
describe('serverPrefetch', () => {
it('should prefetch async operations before rendering', async () => {
const app = new Vue({
setup() {
const count = ref(0)
onServerPrefetch(async () => {
count.value = await fetch(42)
})
return {
count,
}
},
render(h) {
return h('div', this.count)
},
})
const serverRenderer = createRenderer()
const html = await serverRenderer.renderToString(app)
expect(html).toBe('<div data-server-rendered="true">42</div>')
})
it('should prefetch many async operations before rendering', async () => {
const app = new Vue({
setup() {
const count = ref(0)
const label = ref('')
onServerPrefetch(async () => {
count.value = await fetch(42)
})
onServerPrefetch(async () => {
label.value = await fetch('meow')
})
return {
count,
label,
}
},
render(h) {
return h('div', [this.count, this.label])
},
})
const serverRenderer = createRenderer()
const html = await serverRenderer.renderToString(app)
expect(html).toBe('<div data-server-rendered="true">42meow</div>')
})
it('should pass ssrContext', async () => {
const child = {
setup(props, { ssrContext }) {
const content = ref()
expect(ssrContext.foo).toBe('bar')
onServerPrefetch(async () => {
content.value = await fetch(ssrContext.foo)
})
return {
content,
}
},
render(h) {
return h('div', this.content)
},
}
const app = new Vue({
components: {
child,
},
render(h) {
return h('child')
},
})
const serverRenderer = createRenderer()
const html = await serverRenderer.renderToString(app, { foo: 'bar' })
expect(html).toBe('<div data-server-rendered="true">bar</div>')
})
it('should not share context', async () => {
const instances = []
function createApp(context) {
return new Vue({
setup() {
const count = ref(0)
onServerPrefetch(async () => {
count.value = await fetch(context.result)
})
instances.push(getCurrentInstance())
return {
count,
}
},
render(h) {
return h('div', this.count)
},
})
}
const serverRenderer = createRenderer()
const promises = []
// Parallel requests
for (let i = 1; i < 3; i++) {
promises.push(
new Promise(async (resolve) => {
const app = createApp({ result: i })
const html = await serverRenderer.renderToString(app)
expect(html).toBe(`<div data-server-rendered="true">${i}</div>`)
resolve()
})
)
}
await Promise.all(promises)
expect((instances[0] === instances[1]) === instances[2]).toBe(false)
})
})