def test_merge(self):
source = Restrictions(min_length=2, max_length=10)
target = Restrictions(min_length=1, pattern=r"[A-Z]")
target.merge(source)
self.assertEqual(2, target.min_length)
self.assertEqual(10, target.max_length)
self.assertEqual(r"[A-Z]", target.pattern)
def test_merge_ignore_nillable(self):
parent = Restrictions(nillable=True)
child = Restrictions()
child.merge(parent)
self.assertIsNone(child.nillable)
child.nillable = False
child.merge(parent)
self.assertFalse(child.nillable)