Adds a new classmethod, from_class to Interface, for generating an
interface from an existing class. This is useful when you want to create
a class whose interface matches the interface of an existing class you
can't control (e.g., for creating a test double of class defined in a
library).
Adds a new classmethod,
from_classtoInterface, for generating an interface from an existing class. This is useful when you want to create a class whose interface matches the interface of an existing class you can't control (e.g., for creating a test double of class defined in a library).