`SyntheticEvent.type` is undefined when received by the handler. Or the nativeEvent type for that matter.

Needs to be added in here somewhere: https://github.com/facebook/react/blob/3a4e1dbb5b2957875cab6af11a5e5934e125a0d8/src/test/ReactTestUtils.js#L496

I realize that it's not sustainable to have to set _all_ the possible fields for a simulated event, but the type at least makes sense for verification that you're getting the right _sort_ of event.

._renderValidatedComponentWithoutOwnerOrContext,
  }
);
ReactShallowRenderer.prototype.render = function(element, context) {
  
  
  
  ReactDefaultInjection.inject();
  invariant(
    ReactElement.isValidElement(element),
    'ReactShallowRenderer render(): Invalid component element.%s',
    typeof element === 'function' ?
      ' Instead of passing a component class, make sure to instantiate ' +
      'it by passing it to React.createElement.' :
      ''
  );
  invariant(
    typeof element.type !== 'string',
    'ReactShallowRenderer render(): Shallow rendering works only with custom ' +
    'components, not primitives (%s). Instead of calling `.render(el)` and ' +
    'inspecting the rendered output, look at `el.props` directly instead.',
    element.type
  );
  if (!context) {
    context = emptyObject;
  }
  ReactUpdates.batchedUpdates(_batchedRender, this, element, context);
  return this.getRenderOutput();
};
function _batchedRender(renderer, element, context) {