def test_split_cells_single() -> None:
    """Check that split cells splits on cell positions with all single width characters."""
    test = Segment("A" * 20)
    for position in range(1, test.cell_length):
        left, right = Segment.split_cells(test, position)
        assert cell_len(left.text) == position
        assert cell_len(right.text) == test.cell_length - position
Check that split cells splits on cell positions with all single width characters.
tests/test_segment.py