def test_can_unbond_from_atom(self):
atom = Atom("C")
atom2 = Mock(_bonded_atoms={atom})
atom._bonded_atoms = {atom2}
atom.unbond_from(atom2)
self.assertEqual(atom._bonded_atoms, set())
self.assertEqual(atom2._bonded_atoms, set())
def test_bonded_atoms_property(self):
atom = Atom("C", 2, 3, 5)
atom._bonded_atoms = [1, 2, 3]
self.assertEqual(atom.bonded_atoms, {1, 2, 3})