File: test_itertools.py

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import sys
import itertools

def test_chain():
    it = itertools.chain([], [1, 2, 3])
    lst = list(it)
    assert lst == [1, 2, 3]

def test_islice_maxint():
    slic = itertools.islice(itertools.count(), 1, 10, sys.maxsize)
    assert len(list(slic)) == 1

def test_islice_largeint():
    slic = itertools.islice(itertools.count(), 1, 10, sys.maxsize - 20)
    assert len(list(slic)) == 1