App doesn't render in jest tests?

How to / Third Party Tooling
1

Please provide the following:

  1. SDK Version: 43
  2. Platforms(Android/iOS/web/all): all

I’m following the directions in the Testing with Jest expo docs to create a test that just renders the root of my app.

import React from 'react';
import renderer from 'react-test-renderer';

import App from './App';

describe('<App />', () => {
  it('has 1 child', () => {
    const tree = renderer.create(<App />).toJSON();
    expect(tree.children.length).toBe(1);
  });
});

But I get an error because tree.children is null. This is weird, because the app works just fine.

When I created a snapshot, it looks like this:

// Jest Snapshot v1, https://goo.gl/fbAQLP

exports[`<App /> has 1 child 1`] = `
<RNCSafeAreaProvider
  onInsetsChange={[Function]}
  style={
    Array [
      Object {
        "flex": 1,
      },
      undefined,
    ]
  }
/>
`;

Any idea what I’m doing wrong?

2

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