How to use the ocrmypdf.exceptions.ExitCode.ok function in ocrmypdf

german = 'Du siehst den Wald vor lauter Bäumen nicht.'
    chinese = '孔子'

    p, out, err = run_ocrmypdf(
        input_file,
        outpdf,
        '--title',
        german,
        '--author',
        chinese,
        '--output-type',
        output_type,
        env=spoof_tesseract_noop,
    )

    assert p.returncode == ExitCode.ok, err

    before = pikepdf.open(input_file)
    after = pikepdf.open(outpdf)

    assert after.docinfo.Title == german, after.docinfo
    assert after.docinfo.Author == chinese, after.docinfo
    assert after.docinfo.get('/Keywords', '') == ''

    before_date = decode_pdf_date(str(before.docinfo.CreationDate))
    after_date = decode_pdf_date(str(after.docinfo.CreationDate))
    assert before_date == after_date

    pdfa_info = file_claims_pdfa(outpdf)
    assert pdfa_info['output'] == output_type

os.close(0)
        os.close(1)

    p_args = ocrmypdf_exec + [input_file, output_file]
    p = Popen(  # pylint: disable=subprocess-popen-preexec-fn
        p_args,
        close_fds=True,
        stdout=None,
        stderr=PIPE,
        stdin=None,
        env=spoof_tesseract_noop,
        preexec_fn=evil_closer,
    )
    out, err = p.communicate()
    print(err.decode())
    assert p.returncode == ExitCode.ok

def test_oem_on_tess3(resources, no_outpdf):
    p, _, err = pytest.helpers.run_ocrmypdf(
        resources / 'aspect.pdf',
        no_outpdf, '--tesseract-oem', '1')

    assert p.returncode == ExitCode.ok
    assert 'argument ignored' in err

'pdf',
            '-',
            output_file,
        ]
        p = run(
            p_args,
            stdout=PIPE,
            stderr=PIPE,
            stdin=input_stream,
            universal_newlines=True,
            env=spoof_tesseract_noop,
        )

        if im.mode in ('RGBA', 'LA'):
            # If alpha image is input, expect an error
            assert p.returncode != ExitCode.ok and 'alpha' in p.stderr
            return

        assert p.returncode == ExitCode.ok, p.stderr

    pdfinfo = PdfInfo(output_file)

    pdfimage = pdfinfo[0].images[0]

    if input_file.endswith('.png'):
        assert pdfimage.enc != Encoding.jpeg, "Lossless compression changed to lossy!"
    elif input_file.endswith('.jpg'):
        assert pdfimage.enc == Encoding.jpeg, "Lossy compression changed to lossless!"
    if im.mode.startswith('RGB') or im.mode.startswith('BGR'):
        assert pdfimage.color == Colorspace.rgb, "Colorspace changed"
    elif im.mode.startswith('L'):
        assert pdfimage.color == Colorspace.gray, "Colorspace changed"