def METHOD_NAME(tmpdir):
    fake_img = str(tmpdir / 'hello载')
    with open(fake_img, 'w+') as f:
        f.write('hello')
    assert md5sum(fake_img) == '5d41402abc4b2a76b9719d911017c592'
    with open(str(tmpdir / 'hello载.md5sum')) as f:
        assert f.read() == '5d41402abc4b2a76b9719d911017c592'