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transition.test.ts
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transition.test.ts
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import { transition } from './transition'
import { reportChanges } from '../../../test-utils/report-dom-node-changes'
import { disposables } from '../../../utils/disposables'
beforeEach(() => {
document.body.innerHTML = ''
})
it('should be possible to transition', async () => {
let d = disposables()
let snapshots: { content: string; recordedAt: bigint }[] = []
let element = document.createElement('div')
document.body.appendChild(element)
d.add(
reportChanges(
() => document.body.innerHTML,
(content) => {
snapshots.push({
content,
recordedAt: process.hrtime.bigint(),
})
}
)
)
await new Promise<void>((resolve) => {
transition(
element,
{
enter: ['enter'],
enterFrom: ['enterFrom'],
enterTo: ['enterTo'],
leave: [],
leaveFrom: [],
leaveTo: [],
entered: ['entered'],
},
true, // Show
resolve
)
})
await new Promise((resolve) => d.nextFrame(resolve))
// Initial render:
expect(snapshots[0].content).toEqual('<div></div>')
// Start of transition
expect(snapshots[1].content).toEqual('<div class="enter enterFrom"></div>')
// NOTE: There is no `enter enterTo`, because we didn't define a duration. Therefore it is not
// necessary to put the classes on the element and immediately remove them.
// Cleanup phase
expect(snapshots[2].content).toEqual('<div class="enterTo entered"></div>')
d.dispose()
})
it('should wait the correct amount of time to finish a transition', async () => {
let d = disposables()
let snapshots: { content: string; recordedAt: bigint }[] = []
let element = document.createElement('div')
document.body.appendChild(element)
let duration = 20
element.style.transitionDuration = `${duration}ms`
d.add(
reportChanges(
() => document.body.innerHTML,
(content) => {
snapshots.push({
content,
recordedAt: process.hrtime.bigint(),
})
}
)
)
await new Promise<void>((resolve) => {
transition(
element,
{
enter: ['enter'],
enterFrom: ['enterFrom'],
enterTo: ['enterTo'],
leave: [],
leaveFrom: [],
leaveTo: [],
entered: ['entered'],
},
true, // Show
resolve
)
})
await new Promise((resolve) => d.nextFrame(resolve))
// Initial render:
expect(snapshots[0].content).toEqual(`<div style="transition-duration: ${duration}ms;"></div>`)
// Start of transition
expect(snapshots[1].content).toEqual(
`<div style="transition-duration: ${duration}ms;" class="enter enterFrom"></div>`
)
expect(snapshots[2].content).toEqual(
`<div style="transition-duration: ${duration}ms;" class="enter enterTo"></div>`
)
let estimatedDuration = Number(
(snapshots[snapshots.length - 1].recordedAt - snapshots[snapshots.length - 2].recordedAt) /
BigInt(1e6)
)
expect(estimatedDuration).toBeWithinRenderFrame(duration)
// Cleanup phase
expect(snapshots[3].content).toEqual(
`<div style="transition-duration: ${duration}ms;" class="enterTo entered"></div>`
)
})
it('should keep the delay time into account', async () => {
let d = disposables()
let snapshots: { content: string; recordedAt: bigint }[] = []
let element = document.createElement('div')
document.body.appendChild(element)
let duration = 20
let delayDuration = 100
element.style.transitionDuration = `${duration}ms`
element.style.transitionDelay = `${delayDuration}ms`
d.add(
reportChanges(
() => document.body.innerHTML,
(content) => {
snapshots.push({
content,
recordedAt: process.hrtime.bigint(),
})
}
)
)
await new Promise<void>((resolve) => {
transition(
element,
{
enter: ['enter'],
enterFrom: ['enterFrom'],
enterTo: ['enterTo'],
leave: [],
leaveFrom: [],
leaveTo: [],
entered: ['entered'],
},
true, // Show
resolve
)
})
await new Promise((resolve) => d.nextFrame(resolve))
let estimatedDuration = Number(
(snapshots[snapshots.length - 1].recordedAt - snapshots[snapshots.length - 2].recordedAt) /
BigInt(1e6)
)
expect(estimatedDuration).toBeWithinRenderFrame(duration + delayDuration)
})