102 lines
2.9 KiB
TypeScript
102 lines
2.9 KiB
TypeScript
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import { patchEvent } from '../src/modules/events'
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describe(`events`, () => {
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it('should assign event handler', () => {
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const el = document.createElement('div')
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const event = new Event('click')
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const fn = jest.fn()
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patchEvent(el, 'click', null, fn, null)
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el.dispatchEvent(event)
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el.dispatchEvent(event)
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el.dispatchEvent(event)
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expect(fn).toHaveBeenCalledTimes(3)
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})
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it('should update event handler', () => {
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const el = document.createElement('div')
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const event = new Event('click')
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const prevFn = jest.fn()
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const nextFn = jest.fn()
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patchEvent(el, 'click', null, prevFn, null)
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el.dispatchEvent(event)
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patchEvent(el, 'click', prevFn, nextFn, null)
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el.dispatchEvent(event)
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el.dispatchEvent(event)
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expect(prevFn).toHaveBeenCalledTimes(1)
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expect(nextFn).toHaveBeenCalledTimes(2)
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})
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it('should support multiple event handlers', () => {
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const el = document.createElement('div')
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const event = new Event('click')
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const fn1 = jest.fn()
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const fn2 = jest.fn()
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patchEvent(el, 'click', null, [fn1, fn2], null)
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el.dispatchEvent(event)
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expect(fn1).toHaveBeenCalledTimes(1)
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expect(fn2).toHaveBeenCalledTimes(1)
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})
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it('should unassign event handler', () => {
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const el = document.createElement('div')
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const event = new Event('click')
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const fn = jest.fn()
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patchEvent(el, 'click', null, fn, null)
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patchEvent(el, 'click', fn, null, null)
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el.dispatchEvent(event)
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expect(fn).not.toHaveBeenCalled()
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})
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it('should support event options', () => {
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const el = document.createElement('div')
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const event = new Event('click')
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const fn = jest.fn()
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const nextValue = {
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handler: fn,
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options: {
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once: true
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}
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}
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patchEvent(el, 'click', null, nextValue, null)
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el.dispatchEvent(event)
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el.dispatchEvent(event)
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expect(fn).toHaveBeenCalledTimes(1)
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})
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it('should support varying event options', () => {
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const el = document.createElement('div')
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const event = new Event('click')
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const prevFn = jest.fn()
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const nextFn = jest.fn()
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const nextValue = {
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handler: nextFn,
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options: {
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once: true
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}
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}
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patchEvent(el, 'click', null, prevFn, null)
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patchEvent(el, 'click', prevFn, nextValue, null)
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el.dispatchEvent(event)
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el.dispatchEvent(event)
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expect(prevFn).not.toHaveBeenCalled()
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expect(nextFn).toHaveBeenCalledTimes(1)
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})
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it('should unassign event handler with options', () => {
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const el = document.createElement('div')
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const event = new Event('click')
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const fn = jest.fn()
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const nextValue = {
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handler: fn,
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options: {
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once: true
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}
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}
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patchEvent(el, 'click', null, nextValue, null)
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patchEvent(el, 'click', nextValue, null, null)
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el.dispatchEvent(event)
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el.dispatchEvent(event)
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expect(fn).not.toHaveBeenCalled()
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})
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})
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