fix: collapse unit tests by using ddt
fix: collapse unit tests by using ddt

edx/edx-platform,arbrandes/edx-platform,arbrandes/edx-platform,edx/edx-platform,angelapper/edx-platform,eduNEXT/edx-platform,eduNEXT/edx-platform,angelapper/edx-platform,eduNEXT/edx-platform,edx/edx-platform,arbrandes/edx-platform,edx/edx-platform,eduNEXT/edx-platform,angelapper/edx-platform,arbrandes/edx-platform,angelapper/edx-platform