Enzyme: TypeError: Cannot read property 'rendered' of null (v3)

[wojtekmaj]

I have a fairly simple component that renders another component, its navigation. I have test in place to test whether it has been rendered inside. I'm using Jest and Enzyme v3.

  it('renders navigation', () => {
    const component = mount(
      <Calendar />
    );

    const navigation = component.find('.react-calendar__navigation');

    expect(navigation.length).toBe(1);
  });

Interestingly, this test passed without any issues on my computer. However, on Travis CI, I got the following error:

TypeError: Cannot read property 'rendered' of null

  at Object.getNode (node_modules/enzyme-adapter-react-16/build/ReactSixteenAdapter.js:233:69)
  at new ReactWrapper (node_modules/enzyme/build/ReactWrapper.js:100:33)
  at mount (node_modules/enzyme/build/mount.js:19:10)
  at Object.<anonymous> (src/__tests__/Calendar.jsx:13:39)
      at Promise (<anonymous>)
      at <anonymous>
  at process._tickCallback (internal/process/next_tick.js:188:7)

The code worked fine on Enzyme 2.9.1. Do you have any hints on what I could be doing wrong?

[wojtekmaj]

My bad, for some reason React stayed at 15.6.1 causing this error.

[eenewbsauce]

Lol... Had the same thing happen. This issue made me check my package.json and feel shame. Quickly after the shame faded, my tests were working again though. Thanks!

[nickguimond]

Same shame.. so sad

[jaketrent]

Make sure react-dom is also @16, and that will help too. :)