**Do you want to request a _feature_ or report a _bug_?**

Report a bug.

**What is the current behavior?**

When testing components, `Warning: ReactComponentTreeDevtool: Missing React element for debugID 1 when building stack` is shown when calling `TestUtils.renderIntoDocument`.

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template: https://jsfiddle.net/reactjs/69z2wepo/).**

https://github.com/angusfretwell/reproduce-debugid-warning (`npm install && npm test`).

**What is the expected behavior?**

According to #7187 this is an internal warning and shouldn't be displayed.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
- react@15.2.1
- react-addons-test-utils@15.2.1
- react-dom@15.2.1

I didn't receive this warning on 15.2.0.

var key;
  for (key in statusDisplays) {
    if (!statusDisplays.hasOwnProperty(key)) {
      continue;
    }
    if (lastInternalStates[key]) {
      expect(lastInternalStates[key])
        .toEqual(statusDisplays[key].getInternalState());
    }
  }
}
/**
 * Verifies that the internal representation of a set of `renderedChildren`
 * accurately reflects what is in the DOM.
 */
function verifyDomOrderingAccurate(parentInstance, statusDisplays) {