**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 i;
  var container = document.createElement('div');
  var parentInstance = ReactDOM.render(
    <FriendsStatusDisplay {...sequence[0]} />,
    container
  );
  var statusDisplays = parentInstance.getStatusDisplays();
  var lastInternalStates = getInternalStateByUserName(statusDisplays);
  verifyStatuses(statusDisplays, sequence[0]);
  for (i = 1; i < sequence.length; i++) {
    ReactDOM.render(
      <FriendsStatusDisplay {...sequence[i]} />,
      container
    );
    statusDisplays = parentInstance.getStatusDisplays();
    verifyStatuses(statusDisplays, sequence[i]);
    verifyStatesPreserved(lastInternalStates, statusDisplays);
    verifyDomOrderingAccurate(parentInstance, statusDisplays);
    lastInternalStates = getInternalStateByUserName(statusDisplays);
  }
}
describe('ReactMultiChildReconcile', function() {
  beforeEach(function() {
    jest.resetModuleRegistry();
    React = require('React');
    ReactDOM = require('ReactDOM');
    ReactDOMComponentTree = require('ReactDOMComponentTree');
    ReactInstanceMap = require('ReactInstanceMap');
    mapObject = require('mapObject');
  });