title: Jest DOM textcontent additional whitespace
body: <p>I am writing test cases using Jest for a React component.
  The component is a simple input box with a label of "Test Label"</p>
  
  <p>When I try to get the label for a spec it returns the label with additional whitespace like so: " Test Label ", even though the DOM clearly has the content as "Test Label". I've tried using innerText but it doesn't work as I'm guessing it's not supported.</p>
  
  <p>Is there a way to get the value I want - "Test Label"?</p>
  
  <pre><code>...
  const input = TestUtils.renderIntoDocument(
    &lt;p&gt;&lt;label&gt;"Test Label"&lt;/label&gt;&lt;input/&gt;&lt;/p&gt;
  );
  const node = ReactDOM.findDOMNode(input);
  expect(node.querySelector('label').textContent).toBe("Test Label")
  ...
  </code></pre>