The ROSE Challenge is the first robotics and artificial intelligence competition worldwide to implement a third-party performance evaluation of intra-row weeding robots in real conditions, under comparable conditions, to guarantee a credible and objective assessment of their effectiveness. This article reports on the design and validation of testing facilities for this competition, which presents a particular complexity : the experiments take place outdoors and act on living things (crops and weeds). Moreover, it implies to guarantee repeatable experimental conditions for a comparable and equitable evaluation. The article also discusses the opportunity that these competitions represent to define testing facilities in a consensual way. The method it proposes is very widely applicable to different fields of intelligent systems applications.