assert "event: html\n" in text
    assert "data: <div>html fragment</div>\n" in text

    assert "event: csv\n" in text
    assert "data: cpu,87.3,1709145600\n" in text


def test_data_and_raw_data_mutually_exclusive():
    """Cannot set both data and raw_data."""
    with pytest.raises(ValueError, match="Cannot set both"):
        ServerSentEvent(data="json", raw_data="raw")