It begins to hum and the youngest member of the Volkswagen family begins to shake violently on the test bench. Four hydraulic posts under the tires give the Cupra Tavascan a good shake. Infrared headlights cause summer heat, air conditioning systems cause winter temperatures below zero. Meanwhile, a cable supplies the electric car with power. The vehicle has to endure this torture for four weeks before the engineers are convinced that the suspension will last for a 160,000-kilometer lifespan.