JavaScript JS: Promise resolver is not a function promise resolver is not a function

I'm trying to run this jestJS unit-test, but I do get TypeError: Promise resolver undefined is not a function. What am I doing wrong?

it('_onSubmit() should throw error if data is missing', (done) => {
  const createUserMutation = () => new Promise()
  const wrapper = shallow(<CreateAccount createUserMutation={createUserMutation} />)
  wrapper.update().find(Form).simulate('submit', {
    preventDefault: () => {}
  })
  createUserMutation.resolve().then(() => {
    expect(console.error).toHaveBeenCalled()
    done()
  })
})
Answer:1

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