The test for the prerender and postrender events now uses a WebGLPointsLayer instead of a VectorLayer. This is less confusing and probably closer to practical usage, too.
The test only checks if the event is fired. It does not check for the properties of the RenderEvent object.
This is required so that Renderers like WebGLPointsLayerRenderer can fire prerender and postrender events. Problem described in [issue 11463](https://github.com/openlayers/openlayers/issues/11463).