How to use the ocrmypdf.exceptions.MissingDependencyError function in ocrmypdf

def test_old_ghostscript(caplog):
    with patch('ocrmypdf.exec.ghostscript.version', return_value='9.19'), patch(
        'ocrmypdf.exec.tesseract.has_textonly_pdf', return_value=True
    ):
        vd.check_options_output(make_opts(language='chi_sim', output_type='pdfa'))
        assert 'Ghostscript does not work correctly' in caplog.text

    with patch('ocrmypdf.exec.ghostscript.version', return_value='9.18'), patch(
        'ocrmypdf.exec.tesseract.has_textonly_pdf', return_value=True
    ):
        with pytest.raises(MissingDependencyError):
            vd.check_options_output(make_opts(output_type='pdfa-3'))

    with patch('ocrmypdf.exec.ghostscript.version', return_value='9.24'), patch(
        'ocrmypdf.exec.tesseract.has_textonly_pdf', return_value=True
    ):
        with pytest.raises(MissingDependencyError):
            vd.check_dependency_versions(make_opts())

def test_no_unpaper(resources, no_outpdf):
    input_ = fspath(resources / "c02-22.pdf")
    output = fspath(no_outpdf)
    options = parser.parse_args(args=["--clean", input_, output])

    with patch("ocrmypdf.exec.unpaper.version") as mock_unpaper_version:
        mock_unpaper_version.side_effect = FileNotFoundError("unpaper")
        with pytest.raises(MissingDependencyError):
            check_options(options)

with patch('ocrmypdf.exec.ghostscript.version', return_value='9.19'), patch(
        'ocrmypdf.exec.tesseract.has_textonly_pdf', return_value=True
    ):
        vd.check_options_output(make_opts(language='chi_sim', output_type='pdfa'))
        assert 'Ghostscript does not work correctly' in caplog.text

    with patch('ocrmypdf.exec.ghostscript.version', return_value='9.18'), patch(
        'ocrmypdf.exec.tesseract.has_textonly_pdf', return_value=True
    ):
        with pytest.raises(MissingDependencyError):
            vd.check_options_output(make_opts(output_type='pdfa-3'))

    with patch('ocrmypdf.exec.ghostscript.version', return_value='9.24'), patch(
        'ocrmypdf.exec.tesseract.has_textonly_pdf', return_value=True
    ):
        with pytest.raises(MissingDependencyError):
            vd.check_dependency_versions(make_opts())

def test_version_check():
    from ocrmypdf.exec import get_version

    with pytest.raises(MissingDependencyError):
        get_version('NOT_FOUND_UNLIKELY_ON_PATH')

    with pytest.raises(MissingDependencyError):
        get_version('sh', version_arg='-c')

    with pytest.raises(MissingDependencyError):
        get_version('echo')

def test_no_languages(tmp_path):
    env = os.environ.copy()
    (tmp_path / 'tessdata').mkdir()
    env['TESSDATA_PREFIX'] = fspath(tmp_path)

    with pytest.raises(MissingDependencyError):
        tesseract.languages(tesseract_env=env)

def test_german(spoof_tesseract_cache, resources, outdir):
    # Produce a sidecar too - implicit test that system locale is set up
    # properly. It is fine that we are testing -l deu on a French file because
    # we are exercising the functionality not going for accuracy.
    sidecar = outdir / 'francais.txt'
    try:
        check_ocrmypdf(
            resources / 'francais.pdf',
            outdir / 'francais.pdf',
            '-l',
            'deu',  # more commonly installed
            '--sidecar',
            sidecar,
            env=spoof_tesseract_cache,
        )
    except MissingDependencyError:
        if 'deu' not in tesseract.languages():
            pytest.xfail(reason="tesseract-deu language pack not installed")
        raise