def test_circular2(self):
"""
Verify that a circular dependency among 2 objects is detected.
"""
o1 = Identity()
o2 = Identity()
o1.depends_on = ["o2"]
o2.depends_on = ["o1"]
o1.o2 = o2
o2.o1 = o1
with self.assertRaises(RuntimeError):
get_owners(o1)
def test_depth_2(self):
"""
Check cases in which the original object depends on another, which
depends on another.
"""
o1 = Identity()
o2 = Identity()
o3 = object()
o1.depends_on = ["o2"]
o2.depends_on = ["o3"]
o1.o2 = o2
o2.o3 = o3
self.assertEqual(get_owners(o1), [o1, o2, o3])
def test_depth_1(self):
"""
Check cases in which the original object depends on 1 or more others.
"""
o1 = Identity()
o2 = Identity()
o1.o2 = o2
o1.depends_on = ["o2"]
self.assertEqual(get_owners(o1), [o1, o2])
o3 = object()
o1.depends_on = ["o3", "o2"]
o1.o3 = o3
self.assertEqual(get_owners(o1), [o1, o3, o2])
def test_circular4(self):
"""
Verify that a circular dependency among 4 objects is detected.
"""
o1 = Identity()
o2 = Identity()
o3 = Identity()
o4 = Identity()
o1.depends_on = ["o2"]
o2.depends_on = ["o3"]
o3.depends_on = ["o4"]
o4.depends_on = ["o1"]
o1.o2 = o2
o2.o3 = o3
o3.o4 = o4
o4.o1 = o1
with self.assertRaises(RuntimeError):
get_owners(o1)