def test_a_copy_variable_list_is_indepentent(self):
varis = Variables(4)
newVaris = varis.copy()
varis.queens[0].value = 1
varis.queens[0].domain = set([1, 2, 3])
self.assertNotEqual(1, newVaris.queens[0].value)
self.assertNotEqual(set([1, 2, 3]), newVaris.queens[0].domain)
