How to use the pycobertura.cli.ExitCodes function in pycobertura

def test_diff__format_html__with_source_prefix(source1, source2, prefix1, prefix2):
    from pycobertura.cli import diff, ExitCodes

    runner = CliRunner()
    result = runner.invoke(diff, [
        '--format', 'html',
        '--source1', source1,
        '--source2', source2,
        '--source-prefix1', prefix1,
        '--source-prefix2', prefix2,
        'tests/dummy.with-dummy2-better-cov.xml',
        'tests/dummy.with-dummy2-better-and-worse.xml',
    ], catch_exceptions=False)
    assert result.output.startswith('')
    assert result.output.endswith('\n')
    assert result.exit_code == ExitCodes.COVERAGE_WORSENED

def test_exit_codes():
    # We shouldn't change exit codes so that clients can rely on them
    from pycobertura.cli import ExitCodes

    assert ExitCodes.OK == 0
    assert ExitCodes.EXCEPTION == 1
    assert ExitCodes.COVERAGE_WORSENED == 2
    assert ExitCodes.NOT_ALL_CHANGES_COVERED == 3