Fix unit test
Fix unit test

CuraContainerRegistry::load now has a dependency on the ContainerStack
so we need to account for it in our mocks.

hmflash/Cura,hmflash/Cura,ynotstartups/Wanhao,Curahelper/Cura,fieldOfView/Cura,Curahelper/Cura,fieldOfView/Cura,ynotstartups/Wanhao