def test_iter_ngram():
seq = [0, 1, 2, 3, 4]
lst = list(iter_ngram(seq, 1))
assert_equal(lst, [[0], [1], [2], [3], [4]])
lst = list(iter_ngram(seq, 2))
assert_equal(lst, [[0, 1], [1, 2], [2, 3], [3, 4]])
lst = list(iter_ngram(seq, 3))
assert_equal(lst, [[0, 1, 2], [1, 2, 3], [2, 3, 4]])
lst = list(iter_ngram(seq, 3, 2))
assert_equal(lst, [[0, 1], [1, 2], [0, 1, 2], [2, 3], [1, 2, 3], [3, 4], [2, 3, 4]])
lst = list(iter_ngram(seq, 3, 1))
assert_equal(lst, [[0], [1], [0, 1], [2], [1, 2], [0, 1, 2], [3], [2, 3], [1, 2, 3], [4], [3, 4], [2, 3, 4]])
lst = list(iter_ngram(seq, 3, sent_start=9))
assert_equal(lst, [[9, 9, 0], [9, 0, 1], [0, 1, 2], [1, 2, 3], [2, 3, 4]])
lst = list(iter_ngram(seq, 3, sent_end=9))
assert_equal(lst, [[0, 1, 2], [1, 2, 3], [2, 3, 4], [3, 4, 9], [4, 9, 9]])
lst = list(iter_ngram(seq, 3, sent_start=9, sent_end=9))
assert_equal(lst, [[9, 9, 0], [9, 0, 1], [0, 1, 2], [1, 2, 3], [2, 3, 4], [3, 4, 9], [4, 9, 9]])
lst = list(iter_ngram(seq, 3, 2, sent_start=9, sent_end=9))
assert_equal(lst, [[9, 0], [9, 9, 0],
[0, 1], [9, 0, 1],
[1, 2], [0, 1, 2],
[2, 3], [1, 2, 3],
[3, 4], [2, 3, 4],
[4, 9], [3, 4, 9],
[9, 9], [4, 9, 9]])
def test_bad_bounds():
list(iter_ngram(range(10), 2, 3))
