83 lines
1.6 KiB
JavaScript
83 lines
1.6 KiB
JavaScript
/* eslint-env jest */
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import mitt from 'next/dist/shared/lib/mitt'
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describe('mitt', () => {
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describe('With listeners', () => {
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it('should listen to a event', () => {
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return new Promise((resolve) => {
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const ev = mitt()
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ev.on('sample', resolve)
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ev.emit('sample')
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})
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})
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it('should listen to multiple listeners', () => {
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const ev = mitt()
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let cnt = 0
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ev.on('sample', () => {
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cnt += 1
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})
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ev.on('sample', () => {
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cnt += 1
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})
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ev.emit('sample')
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expect(cnt).toBe(2)
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})
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it('should listen to multiple events', () => {
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const ev = mitt()
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const data = []
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const cb = (name) => {
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data.push(name)
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}
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ev.on('sample1', cb)
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ev.on('sample2', cb)
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ev.emit('sample1', 'one')
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ev.emit('sample2', 'two')
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expect(data).toEqual(['one', 'two'])
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})
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it('should support multiple arguments', () => {
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const ev = mitt()
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let data
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ev.on('sample', (...args) => {
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data = args
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})
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ev.emit('sample', 'one', 'two')
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expect(data).toEqual(['one', 'two'])
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})
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it('should possible to stop listening an event', () => {
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const ev = mitt()
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let cnt = 0
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const cb = () => {
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cnt += 1
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}
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ev.on('sample', cb)
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ev.emit('sample')
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expect(cnt).toBe(1)
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ev.off('sample', cb)
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ev.emit('sample')
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expect(cnt).toBe(1)
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})
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})
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describe('Without a listener', () => {
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it('should not fail to emit', () => {
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const ev = mitt()
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ev.emit('aaaa', 10, 20)
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})
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})
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})
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