def METHOD_NAME(self):
    """
    Test background on <tr> tag;
    If it works, "darkgreen" will be returned as hexval "0x006400"
    """
    html = """
    <html>
    <head>
        <style>
        tr { background-color: darkgreen }
        </style>
    </head>
    <body>
        <table>
            <tr>
                <td>Test</td>
            </tr>
        </table>
    </body>
    </html>
    """
    context = pisaParser(BytesIO(html.encode('utf-8')), pisaContext(None))
    table = context.story[0]
    color = table._bkgrndcmds[0][3]
    self.assertEqual(color.hexval(), '0x006400', '"background-color" in CSS not equal with output!')