The high throughput x-ray spectroscopy mission (XMM) is a 'cornerstone' project in the ESA Long-Term Programme for Space Science. The satellite observatory uses three grazing incidence mirror modules coupled to reflection grating spectrometers and x-ray CCD cameras. In order to achieve a large effective area, each XMM mirror module consists of 58 Wolter I mirrors which are nested in a coaxial and cofocal configuration, in 1995-96, a qualification model of an XMM mirror module which includes a representative number of mirror shells was manufactured. This model was sent to the CSL and PANTER facilities for UV and x-ray testing. The present paper describes the results of the pre-environmental tests performed at these facilities.