def test_shuffle_key(self):
cases = [
(lambda x: x, ["a", "d", "b", "c"]),
(lambda x: x.upper(), ["d", "c", "a", "b"]),
]
for num, (key, expected) in enumerate(cases, start=1):
with self.subTest(num=num):
shuffler = Shuffler(seed=1234)
actual = shuffler.shuffle(["a", "b", "c", "d"], key)
self.assertEqual(actual, expected)
def test_shuffle_key(self):
cases = [
(lambda x: x, ['a', 'd', 'b', 'c']),
(lambda x: x.upper(), ['d', 'c', 'a', 'b']),
]
for num, (key, expected) in enumerate(cases, start=1):
with self.subTest(num=num):
shuffler = Shuffler(seed=1234)
actual = shuffler.shuffle(['a', 'b', 'c', 'd'], key)
self.assertEqual(actual, expected)
def test_shuffle_consistency(self):
seq = [str(n) for n in range(5)]
cases = [
(None, ["3", "0", "2", "4", "1"]),
(0, ["3", "2", "4", "1"]),
(1, ["3", "0", "2", "4"]),
(2, ["3", "0", "4", "1"]),
(3, ["0", "2", "4", "1"]),
(4, ["3", "0", "2", "1"]),
]
shuffler = Shuffler(seed=1234)
for index, expected in cases:
with self.subTest(index=index):
if index is None:
new_seq = seq
else:
new_seq = seq.copy()
del new_seq[index]
actual = shuffler.shuffle(new_seq, lambda x: x)
self.assertEqual(actual, expected)
def test_shuffle_same_hash(self):
shuffler = Shuffler(seed=1234)
msg = "item 'A' has same hash 'a56ce89262959e151ee2266552f1819c' as item 'a'"
with self.assertRaisesMessage(RuntimeError, msg):
shuffler.shuffle(["a", "b", "A"], lambda x: x.upper())