@logicflow/core/__tests__/event/event.test.ts

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import EventEmitter from '../../src/event/eventEmitter'

describe('event/eventEmitter', () => {
  const em = new EventEmitter()
  test('event emitter', () => {
    const fn = jest.fn()
    em.on('test', fn)
    em.emit('test', { a: 1 })
    expect(fn).toBeCalledWith({ a: 1 })
    em.off('test', fn)
    em.emit('test', { a: 1 })
    expect(fn).toBeCalledTimes(1)

    em.once('test1', fn)
    em.emit('test1', { a: 1 })
    expect(fn).toBeCalledTimes(2)
    em.once('test1', fn)
    em.emit('test1', { a: 1 })
    const test1Events = em.getEvents().test1
    expect(test1Events).toBeUndefined()
  })
})