pyqgis - Adding WMS layer in QGIS standalone Python script

How do I add a WMS layer on a map, in a standalone Python script with QGIS 2.4?

The methodology explained at the bottom of the official QGIS documentation page seems to be outdated and does not work: http://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/loadlayer.html