/
utils.js
334 lines (305 loc) Β· 9.78 KB
/
utils.js
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/* eslint-disable testing-library/no-node-access */
import {eventMap} from '@testing-library/dom/dist/event-map'
import {isElementType} from '../../utils'
// this is pretty helpful:
// https://codesandbox.io/s/quizzical-worker-eo909
// all of the stuff below is complex magic that makes the simpler tests work
// sorrynotsorry...
const unstringSnapshotSerializer = {
test: val => val && val.hasOwnProperty('snapshot'),
print: val => val.snapshot,
}
expect.addSnapshotSerializer(unstringSnapshotSerializer)
function setup(ui, {eventHandlers} = {}) {
const div = document.createElement('div')
div.innerHTML = ui.trim()
document.body.append(div)
return {
element: div.firstChild,
elements: div.children,
// for single elements add the listeners to the element for capturing non-bubbling events
...addListeners(div.children.length === 1 ? div.firstChild : div, {
eventHandlers,
}),
}
}
function setupSelect({
disabled = false,
disabledOptions = false,
multiple = false,
pointerEvents = 'auto',
} = {}) {
const form = document.createElement('form')
form.innerHTML = `
<select
name="select"
style="pointer-events: ${pointerEvents}"
${disabled ? 'disabled' : ''}
${multiple ? 'multiple' : ''}
>
<option value="1" ${disabledOptions ? 'disabled' : ''}>1</option>
<option value="2" ${disabledOptions ? 'disabled' : ''}>2</option>
<option value="3" ${disabledOptions ? 'disabled' : ''}>3</option>
</select>
`
document.body.append(form)
const select = form.querySelector('select')
const options = Array.from(form.querySelectorAll('option'))
return {
...addListeners(select),
form,
select,
options,
}
}
function setupListbox() {
const wrapper = document.createElement('div')
wrapper.innerHTML = `
<button id="button" aria-haspopup="listbox">
Some label
</button>
<ul
role="listbox"
name="listbox"
aria-labelledby="button"
>
<li id="1" role="option" aria-selected="false">1</li>
<li id="2" role="option" aria-selected="false">2</li>
<li id="3" role="option" aria-selected="false">3</li>
</ul>
`
document.body.append(wrapper)
const listbox = wrapper.querySelector('[role="listbox"]')
const options = Array.from(wrapper.querySelectorAll('[role="option"]'))
// the user is responsible for handling aria-selected on listbox options
options.forEach(el =>
el.addEventListener('click', e =>
e.target.setAttribute(
'aria-selected',
JSON.stringify(!JSON.parse(e.target.getAttribute('aria-selected'))),
),
),
)
return {
...addListeners(listbox),
listbox,
options,
}
}
const eventLabelGetters = {
KeyboardEvent(event) {
return [
event.key,
typeof event.keyCode === 'undefined' ? null : `(${event.keyCode})`,
]
.join(' ')
.trim()
},
MouseEvent(event) {
// https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/button
const mouseButtonMap = {
0: 'Left',
1: 'Middle',
2: 'Right',
3: 'Browser Back',
4: 'Browser Forward',
}
return `${mouseButtonMap[event.button]} (${event.button})`
},
}
let eventListeners = []
// asside from the hijacked listener stuff here, it's also important to call
// this function rather than simply calling addEventListener yourself
// because it adds your listener to an eventListeners array which is cleaned
// up automatically which will help use avoid memory leaks.
function addEventListener(el, type, listener, options) {
eventListeners.push({el, type, listener})
el.addEventListener(type, listener, options)
}
function getElementValue(element) {
if (isElementType(element, 'select') && element.multiple) {
return JSON.stringify(Array.from(element.selectedOptions).map(o => o.value))
} else if (element.getAttribute('role') === 'listbox') {
return JSON.stringify(
element.querySelector('[aria-selected="true"]')?.innerHTML,
)
} else if (element.getAttribute('role') === 'option') {
return JSON.stringify(element.innerHTML)
} else if (
element.type === 'checkbox' ||
element.type === 'radio' ||
isElementType(element, 'button')
) {
// handled separately
return null
}
return JSON.stringify(element.value)
}
function getElementDisplayName(element) {
const value = getElementValue(element)
const hasChecked = element.type === 'checkbox' || element.type === 'radio'
return [
element.tagName.toLowerCase(),
element.id ? `#${element.id}` : null,
element.name ? `[name="${element.name}"]` : null,
element.htmlFor ? `[for="${element.htmlFor}"]` : null,
value ? `[value=${value}]` : null,
hasChecked ? `[checked=${element.checked}]` : null,
isElementType(element, 'option') ? `[selected=${element.selected}]` : null,
element.getAttribute('role') === 'option'
? `[aria-selected=${element.getAttribute('aria-selected')}]`
: null,
]
.filter(Boolean)
.join('')
}
function addListeners(element, {eventHandlers = {}} = {}) {
const eventHandlerCalls = {current: []}
const generalListener = jest
.fn(event => {
const callData = {
event,
elementDisplayName: getElementDisplayName(event.target),
}
if (element.testData && !element.testData.handled) {
callData.testData = element.testData
// sometimes firing a single event (like click on a checkbox) will
// automatically fire more events (line input and change).
// and we don't want the test data applied to those, so we'll store
// this and not add the testData to our call if that was already handled
element.testData.handled = true
}
eventHandlerCalls.current.push(callData)
})
.mockName('eventListener')
const listeners = Object.keys(eventMap)
for (const name of listeners) {
addEventListener(element, name.toLowerCase(), (...args) => {
const handler = eventHandlers[name]
if (handler) {
generalListener(...args)
return handler(...args)
}
return generalListener(...args)
})
}
// prevent default of submits in tests
if (isElementType(element, 'form')) {
addEventListener(element, 'submit', e => e.preventDefault())
}
function getEventSnapshot() {
const eventCalls = eventHandlerCalls.current
.map(({event, testData, elementDisplayName}) => {
const eventLabel =
eventLabelGetters[event.constructor.name]?.(event) ?? ''
const modifiers = ['altKey', 'shiftKey', 'metaKey', 'ctrlKey']
.filter(key => event[key])
.map(k => `{${k.replace('Key', '')}}`)
.join('')
const firstLine = [
`${elementDisplayName} - ${event.type}`,
[eventLabel, modifiers].filter(Boolean).join(' '),
]
.filter(Boolean)
.join(': ')
return [firstLine, testData?.before ? getChanges(testData) : null]
.filter(Boolean)
.join('\n')
})
.join('\n')
.trim()
if (eventCalls.length) {
return {
snapshot: [
`Events fired on: ${getElementDisplayName(element)}`,
eventCalls,
].join('\n\n'),
}
} else {
return {
snapshot: `No events were fired on: ${getElementDisplayName(element)}`,
}
}
}
const clearEventCalls = () => {
generalListener.mockClear()
eventHandlerCalls.current = []
}
const getEvents = type =>
generalListener.mock.calls
.map(([e]) => e)
.filter(e => !type || e.type === type)
const eventWasFired = eventType => getEvents().some(e => e.type === eventType)
function getClickEventsSnapshot() {
const lines = getEvents().map(
({constructor, type, button, buttons, detail}) =>
constructor.name === 'MouseEvent'
? `${type} - button=${button}; buttons=${buttons}; detail=${detail}`
: type,
)
return {snapshot: lines.join('\n')}
}
return {
getEventSnapshot,
getClickEventsSnapshot,
clearEventCalls,
getEvents,
eventWasFired,
}
}
function getValueWithSelection({value, selectionStart, selectionEnd}) {
return [
value.slice(0, selectionStart),
...(selectionStart === selectionEnd
? ['{CURSOR}']
: [
'{SELECTION}',
value.slice(selectionStart, selectionEnd),
'{/SELECTION}',
]),
value.slice(selectionEnd),
].join('')
}
const changeLabelGetter = {
value: ({before, after}) =>
[
JSON.stringify(getValueWithSelection(before)),
JSON.stringify(getValueWithSelection(after)),
].join(' -> '),
checked: ({before, after}) =>
[
before.checked ? 'checked' : 'unchecked',
after.checked ? 'checked' : 'unchecked',
].join(' -> '),
// unfortunately, changing a select option doesn't happen within fireEvent
// but rather imperatively via `options.selected = newValue`
// because of this we don't (currently) have a way to track before/after
// in a given fireEvent call.
}
changeLabelGetter.selectionStart = changeLabelGetter.value
changeLabelGetter.selectionEnd = changeLabelGetter.value
const getDefaultLabel = ({key, before, after}) =>
`${key}: ${JSON.stringify(before[key])} -> ${JSON.stringify(after[key])}`
function getChanges({before, after}) {
const changes = new Set()
for (const key of Object.keys(before)) {
if (after[key] !== before[key]) {
changes.add(
(changeLabelGetter[key] ?? getDefaultLabel)({key, before, after}),
)
}
}
return Array.from(changes)
.filter(Boolean)
.map(line => ` ${line}`)
.join('\n')
}
// eslint-disable-next-line jest/prefer-hooks-on-top
afterEach(() => {
for (const {el, type, listener} of eventListeners) {
el.removeEventListener(type, listener)
}
eventListeners = []
document.body.innerHTML = ''
})
export {setup, setupSelect, setupListbox, addEventListener, addListeners}