  Quality requirements is a difficult concept in software projects, and testing
software qualities is a well-known challenge. Without proper management of
quality requirements, there is an increased risk that the software product
under development will not meet the expectations of its future users. In this
paper, we share experiences from testing quality requirements when developing a
large system-of-systems in the public sector in Sweden. We complement the
experience reporting by analyzing documents from the case under study. As a
final step, we match the identified challenges with solution proposals from the
literature. We report five main challenges covering inadequate requirements
engineering and disconnected test managers. Finally, we match the challenges to
solutions proposed in the scientific literature, including integrated
requirements engineering, the twin peaks model, virtual plumblines, the QUPER
model, and architecturally significant requirements. Our experiences are
valuable to other large development projects struggling with testing of quality
requirements. Furthermore, the report could be used by as input to process
improvement activities in the case under study.
