Pillow/Tests/test_image_tobitmap.py

import pytest

from .helper import assert_image_equal, fromstring, hopper


def test_sanity():

    with pytest.raises(ValueError):
        hopper().tobitmap()

    im1 = hopper().convert("1")

    bitmap = im1.tobitmap()

    assert isinstance(bitmap, bytes)
    assert_image_equal(im1, fromstring(bitmap))