**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.

key={'clickLog' + i}
          ref={'clickLog' + i}
        />
      );
    }
    return (
      <span className="clickIncrementer" onClick={this.handleClick}>
        {children}
      </span>
    );
  },
});
/**
 * Only purpose is to test that refs are tracked even when applied to a
 * component that is injected down several layers. Ref systems are difficult to
 * build in such a way that ownership is maintained in an airtight manner.
 */
var GeneralContainerComponent = React.createClass({
  render: function() {
    return <div>{this.props.children}</div>;
  },
});
/**
 * Notice how refs ownership is maintained even when injecting a component
 * into a different parent.
 */
var TestRefsComponent = React.createClass({
  doReset: function() {
    this.refs.myCounter.triggerReset();
  },