message: test:improve reserved props test
diff: @@ -490,11 +490,12 @@ describe('Options props', () => {
  })
  it('warn reserved props', () => {
  + const specialAttrs = ['key', 'ref', 'slot', 'is']
  new Vue({
  - props: {
  - key: String
  - }
  + props: specialAttrs
  + })
  + specialAttrs.forEach(attr => {
  + expect(`"${attr}" is a reserved attribute`).toHaveBeenWarned()
  })
  - expect(`"key" is a reserved attribute`).toHaveBeenWarned()
  })
  })
  