def test_put_remove(self):
ps = PowerSet()
ps.put('123')
ps.put('546')
ps.remove('546')
data = ps.list_value()
res = ['123']
self.assertEqual(data, res)
def test_put_remove_step(self):
ps = PowerSet()
ps.put('0')
ps.put(':')
ps.put('D')
ps.remove(':')
data = sorted(ps.list_value())
res = sorted(['0', 'D'])
self.assertEqual(data, res)
