Given a Zope interface IFoo, the method below creates a Mock (http://www.voidspace.org.uk/python/mock/) subclass IFooMock that properly implements IFoo.

See http://programmaticallyspeaking.com/?p=30 for more info.


from mock import Mock
from zope.interface import classImplements
import types

def create_interface_mock(interface_class):
"""Dynamically create a Mock sub class that implements the given Zope interface class."""

# the init method, automatically specifying the interface methods
def init(self, *args, **kwargs):
Mock.__init__(self, spec=interface_class.names(),
*args, **kwargs)

# we derive the sub class name from the interface name
name = interface_class.__name__ + "Mock"

# create the class object and provide the init method
klass = types.TypeType(name, (Mock, ), {"__init__": init})

# the new class should implement the interface
classImplements(klass, interface_class)

# make the class available to unit tests
globals()[name] = klass


Read more: http://feeds.dzone.com/~r/dzone/snippets/~3/zZgtyd9Tmm4/13649