Fix tests

tests/TestMachineManager.py

@@ -15,6 +15,7 @@ def machine_manager(application, extruder_manager, container_registry, global_st
     application.getGlobalContainerStack = MagicMock(return_value = global_stack)
     with patch("cura.Settings.CuraContainerRegistry.CuraContainerRegistry.getInstance", MagicMock(return_value=container_registry)):
         manager = MachineManager(application)
+        manager._onGlobalContainerChanged()
 
     return manager