**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 clickLogs =
    ReactTestUtils.scryRenderedDOMComponentsWithClass(instance, 'clickLogDiv');
  expect(clickLogs.length).toBe(length);
  expect(Object.keys(instance.refs.myCounter.refs).length).toBe(length);
};
describe('reactiverefs', function() {
  beforeEach(function() {
    jest.resetModuleRegistry();
    React = require('React');
    ReactTestUtils = require('ReactTestUtils');
    reactComponentExpect = require('reactComponentExpect');
  });
  /**
   * Ensure that for every click log there is a corresponding ref (from the
   * perspective of the injected ClickCounter component.
   */
  it('Should increase refs with an increase in divs', function() {
    var testRefsComponent = renderTestRefsComponent();
    var clickIncrementer =
      ReactTestUtils.findRenderedDOMComponentWithClass(
        testRefsComponent,
        'clickIncrementer'
      );
    expectClickLogsLengthToBe(testRefsComponent, 1);
    
    ReactTestUtils.Simulate.click(testRefsComponent.refs.resetDiv);
    expectClickLogsLengthToBe(testRefsComponent, 1);
    
    ReactTestUtils.Simulate.click(clickIncrementer);
    expectClickLogsLengthToBe(testRefsComponent, 2);