The MAJIS (Moons And Jupiter Imaging Spectrometer) instrument is part of the science payload of the ESA L-Class mission JUICE (Jupiter ICy Moons Explorer) to be launched in 2022 with an arrival at Jupiter in 2030. The subsystems of the instrument, and in particular its detectors, need to be characterized in the laboratory before being tested at instrument level after the integration. During 2018 and early 2019, the design and development of the calibration bench to characterize the VIS-NIR detectors of MAJIS was completed. The next step is to validate the facility by using the Structural Model (STM) of the VIS-NIR Focal Plane Unit (FPU) and the Engineering Model (EM) of the VIS-NIR detectors. Here we present a description of the validation tests and the expected results. The characterization of the spare and flight models of the MAJIS VIS-NIR detectors is intended to be completed by the end of 2019.