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