def test_noCommonParent(self):
"""
_commonParent should return None for two classes which do not have a common
parent.
"""
self.assertIdentical(sharing._commonParent(self.A, self.Q), None)
def test_commonParentOfYourself(self):
"""
The common parent of the same object is itself.
"""
self.assertIdentical(sharing._commonParent(self.A, self.A), self.A)
def test_commonParent(self):
"""
Verify the function which determines the common parent of two interfaces.
"""
self.assertEquals(sharing._commonParent(self.Z, self.D), self.B)