'Test to make sure that objects retain identity properly.'

def test_identity(self):

    x = []
    y = x
    x.append(y)
    x.append(y)
    self.assertIs(x[0], x[1])
    self.assertIs(x[0][0], x)
    s = jelly.jelly(x)
    z = jelly.unjelly(s)
    self.assertIs(z[0], z[1])
    self.assertIs(z[0][0], z)
