how to use pymox mock bigworld module

mox_demo1.py

import mox
import stubout

#test function  tearup
m = mox.Mox()
BigWorld = m.CreateMockAnything()
m.StubOutWithMock(BigWorld,"entities")
m.StubOutWithMock(BigWorld,"singleton")
#Great,prepare clientside input data for function be called.
BigWorld.entities.get(100).AndReturn(None)

#stub we can stub property to BigWorld.bots ?
stub = stubout.StubOutForTesting()
stub.Set(BigWorld, 'entities2', {}) ## good . we can access it with property entities2


BigWorld.singleton.evtImpEvent(1,None,20).AndReturn("i trigger event")

#tearup
m.ReplayAll()



### call ####
print BigWorld.singleton.evtImpEvent(1,None,20) # GlobalTechConfig.EVT_CHARGE_POINT_UPDATE, None, self.chargePoint )
e = BigWorld.entities.get(100)
BigWorld.entities2[100] = m
print BigWorld.entities2.get(100)

#teardown
m.VerifyAll()
#

print e
assert e == None