all files / src/events/__tests__/ createOnDragStart.spec.js

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import expect, {createSpy} from 'expect'
import createOnDragStart, {dataKey} from '../createOnDragStart'
 
describe('createOnDragStart', () => {
  it('should return a function', () => {
    expect(createOnDragStart())
      .toExist()
      .toBeA('function')
  })
 
  it('should return a function that calls dataTransfer.setData with key and result from value', () => {
    const setData = createSpy()
    createOnDragStart('foo', 'bar')({
      dataTransfer: {setData}
    })
    expect(setData)
      .toHaveBeenCalled()
      .toHaveBeenCalledWith(dataKey, 'bar')
  })
 
})