def test_line_of_index_multi_line():
text = "\nfoo\n\nbar baz\n"
assert line_of_index(text, 0) == ""
assert line_of_index(text, 1) == "foo"
assert line_of_index(text, 2) == "foo"
assert line_of_index(text, 3) == "foo"
assert line_of_index(text, 4) == "foo"
assert line_of_index(text, 5) == ""
assert line_of_index(text, 6) == "bar baz"
assert line_of_index(text, 12) == "bar baz"
assert line_of_index(text, 13) == "bar baz"
assert line_of_index(text, 14) == ""
def test_line_of_index_one_line():
text = "foo bar baz"
assert line_of_index(text, 0) == text
assert line_of_index(text, 5) == text
assert line_of_index(text, len(text)) == text