Observed this on react@16.0.0-beta.5

```js
import React from 'react';
import { renderToString } from 'react-dom/server';

const B = () => 'b';

console.log(renderToString(<div>{'a'}<B />{'c'}</div>));
```

This renders as `<div data-reactroot="">a<!-- -->bc</div>`. If you try to hydrate this you'll get the error: Text content did not match. Server: "bc" Client: "b".
});
      itRenders('a div with a child', async render => {
        const e = await render(<div id="parent"><div id="child" /></div>);
        expect(e.id).toBe('parent');
        expect(e.childNodes.length).toBe(1);
        expect(e.childNodes[0].id).toBe('child');
        expect(e.childNodes[0].childNodes.length).toBe(0);
      });
      itRenders('a div with multiple children', async render => {
        const e = await render(
          <div id="parent"><div id="child1" /><div id="child2" /></div>,
        );
        expect(e.id).toBe('parent');
        expect(e.childNodes.length).toBe(2);
        expect(e.childNodes[0].id).toBe('child1');
        expect(e.childNodes[0].childNodes.length).toBe(0);
        expect(e.childNodes[1].id).toBe('child2');
        expect(e.childNodes[1].childNodes.length).toBe(0);
      });
      itRenders(
        'a div with multiple children separated by whitespace',
        async render => {
          const e = await render(
            <div id="parent"><div id="child1" /> <div id="child2" /></div>,
          );
          expect(e.id).toBe('parent');
          let child1, child2, textNode;
          expect(e.childNodes.length).toBe(3);
          child1 = e.childNodes[0];
          textNode = e.childNodes[1];