def test_3elements(self):
card1 = Card("a", "b")
card2 = Card("c", "d")
card3 = Card("e", "f")
x = Deck([card1, card2, card3])
x.shuffle_riffle()
self.assertSetEqual(set(x), set([card1, card2, card3]))
def test_full(self):
x = Deck()
before = set(x)
after = set(x)
x.shuffle_riffle()
self.assertSetEqual(before, after)
def test_1element(self):
card = Card("a", "b")
x = Deck([card])
x.shuffle_riffle()
self.assertEqual(x, [card])
def test_empty(self):
x = Deck()
x[:] = []
x.shuffle_riffle()
self.assertEqual(x, [])
