**Do you want to request a *feature* or report a *bug*?**
bug.

**What is the current behavior?**
This addresses a bug in `enzyme`, https://github.com/airbnb/enzyme/issues/1683.

On [this line](https://github.com/facebook/react/blob/master/packages/react-test-renderer/src/ReactShallowRenderer.js#L110) `element.type()` invokes the SFC with `element` as the `this` value. I believe that this is needed for create-react-class components, but that there needs to be a separate branch for SFCs.

**What is the expected behavior?**
`this` inside a strict-mode SFC will be `undefined`, not the element.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
In all of React 0.13, 0.14, 15, and 16, this bug exists.

While the bug ideally will be fixed, I understand that it's highly unlikely that it would be backported to the 14/15 lines - but I can wrap around it if there's a reliable way, in those versions, to distinguish SFCs from create-react-class components (is there?).
return <div>{this.context.name}</div>;
      }
    }
    const shallowRenderer = createRenderer();
    expect(() => shallowRenderer.render(<SimpleComponent />)).toWarnDev(
      'Warning: Failed context type: The context `name` is marked as ' +
        'required in `SimpleComponent`, but its value is `undefined`.\n' +
        '    in SimpleComponent (at **)',
    );
  });
  it('should warn about propTypes (but only once)', () => {
    class SimpleComponent extends React.Component {
      render() {
        return React.createElement('div', null, this.props.name);
      }
    }
    SimpleComponent.propTypes = {
      name: PropTypes.string.isRequired,
    };
    const shallowRenderer = createRenderer();
    expect(() =>
      shallowRenderer.render(React.createElement(SimpleComponent, {name: 123})),
    ).toWarnDev(
      'Warning: Failed prop type: Invalid prop `name` of type `number` ' +
        'supplied to `SimpleComponent`, expected `string`.\n' +
        '    in SimpleComponent',
    );
  });
  it('should enable rendering of cloned element', () => {
    class SimpleComponent extends React.Component {