def test_normal_peek():
"""Test chunk with peeking at iterable."""
# chunk with multiple but peek makes it non-multiple
data = iter('ABCDEFGH')
res = chunk(data, 2)
assert next(res) == ('A', 'B')
assert next(data) == 'C'
assert list(res) == [('D', 'E'), ('F', 'G'), ('H',)]
assert list(data) == []
# chunk with non-multiple but peek makes it multiple
data = iter('ABCDEFG')
res = chunk(data, 2)
assert next(res) == ('A', 'B')
assert next(data) == 'C'
assert list(res) == [('D', 'E'), ('F', 'G')]
assert list(data) == []
# chunk with non-multiple but peek makes it multiple
data = iter('ABC')
res = chunk(data, 2)
assert next(res) == ('A', 'B')
assert next(data) == 'C'
assert list(res) == []
assert list(data) == []
def test_normal():
"""Test chunk."""
# chunk with multiple
data = iter('ABCDEFGH')
res = chunk(data, 2)
assert next(res) == ('A', 'B')
assert list(res) == [('C', 'D'), ('E', 'F'), ('G', 'H')]
assert list(data) == []
# chunk with non-multiple
data = iter('ABCDEFG')
res = chunk(data, 2)
assert next(res) == ('A', 'B')
assert list(res) == [('C', 'D'), ('E', 'F'), ('G',)]
assert list(data) == []
# chunk with non-multiple
data = iter('A')
res = chunk(data, 2)
assert next(res) == ('A',)
assert list(res) == []
assert list(data) == []
# chunk empty
data = ()
res = chunk(data, 2)
assert list(res) == []
# chunk nothing
data = iter('ABCDEFG')
res = chunk(data, 0)
assert list(res) == []
assert list(data) == ['A', 'B', 'C', 'D', 'E', 'F', 'G']
def test_oddity():
"""Test oddities of chunk."""
# chunk negative does nothing
data = iter('ABCDEFG')
res = chunk(data, -1)
assert list(res) == []
assert list(data) == ['A', 'B', 'C', 'D', 'E', 'F', 'G']
# chunk negative does nothing
data = ()
res = chunk(data, -1)
assert list(res) == []