Currently if React is not loaded, ReactDOM shows this:

<img width="664" alt="screen shot 2017-08-08 at 3 36 52 pm" src="https://user-images.githubusercontent.com/810438/29077217-784c7624-7c4f-11e7-88bc-b055407523a9.png">

We should throw a nicer error message in the entry point I think.
var fakeNativeEvent = {};
        ReactTestUtils.simulateNativeEventOnNode(
          'topClick',
          target,
          fakeNativeEvent,
        );
      }
      click(node);
      expect(ops).toEqual(['A']);
      ops = [];
      
      inst.flip();
      click(node);
      expect(ops).toEqual(['B']);
      ops = [];
      
      inst.tick();
      click(node);
      expect(ops).toEqual(['B']);
      ops = [];
      
      
      
      
      ReactDOM.render(
        [<Example key="a" forceA={true} />, <Click key="b" />],