At now multiple instances of extension suits include exist inside test suits tree (see diagram).  This may to lead to unwanted behavior. For example, method `checkout.SetupSuite()` will be called twice - one for each embedded struct.
At now multiple instances of extension suits include exist inside test suits tree (see diagram).

This may to lead to unwanted behavior. For example, method
checkout.SetupSuite()will be called twice - one for each embedded struct.