The Pierre Auger Observatory, the largest cosmic ray
detector ever built, has been collecting scientific data since
2004. As part of the AugerPrime upgrade, the Observatory is
currently undergoing a modification of the surface detector
stations, which involves a replacement of their electronics with
a faster and a more powerful system that provides channels for
additional detectors as well as increased dynamic range and
processing capability, higher sampling frequency, and improved
timing, calibration and monitoring systems. The testing of the new
electronics boards will be conducted in three stages: the production
test performed at the manufacturer site, the climate tests including
accelerated ageing executed in a laboratory and finally the full
functionality tests effectuated before the deployment at the
Observatory in Argentina. A description of the test benches and the
testing procedures is given together with some examples of the
performance of the prototype.