Enzyme cannot find child component in shallow test

Is this not the correct way to render a react/reflux test with enzyme but without the store, ie, "dumb"

import React from 'react'
import { shallow, render } from 'enzyme'
import { Controls } from '../Controls' // named export
import LoadingSpinner from '../LoadingSpinner'
let wrapper
let loadingFlags = {
  controls: true
}
describe('<Controls />', () => {
  it('should render only the loading spinner', () => {
    wrapper = shallow(<Controls loadingFlags={loadingFlags} />) // this ensures the spinner will show until data is ready
    expect(wrapper.length).toEqual(1) // test passes
    expect(wrapper.find(LoadingSpinner)).to.have.length(1)
    // ^ TypeError: Cannot read property 'have' of undefined
  })
})

When I log wrapper.html() I can see the <img class='spinner' /> is rendered, but enzyme cannot find it as a component. To me, the docs indicate this is exactly what I should be doing. I suppose I could check for a child with that class, but that seems messier than checking for the component itself, eg the class changes within the Spinner component.

How can I test for the existence of this child component?