'Test writing a comments with no cell data.'

def test_assemble_xml_file(self):

    self.maxDiff = None
    fh = StringIO()
    comments = Comments()
    comments._set_filehandle(fh)
    comments._assemble_xml_file([[1, 1, 'Some    text', 'John', None, 81, [2, 0, 4, 4, 143, 10, 128, 74]]])
    exp = _xml_to_list('\n                                                                <?xml    version="1.0"    encoding="UTF-8"    standalone="yes"?>\n                                                                <comments    xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">\n                                                                        <authors>\n                                                                                <author>John</author>\n                                                                        </authors>\n                                                                        <commentList>\n                                                                                <comment    ref="B2"    authorId="0">\n                                                                                        <text>\n                                                                                                <r>\n                                                                                                        <rPr>\n                                                                                                                <sz    val="8"/>\n                                                                                                                <color    indexed="81"/>\n                                                                                                                <rFont    val="Tahoma"/>\n                                                                                                                <family    val="2"/>\n                                                                                                        </rPr>\n                                                                                                        <t>Some    text</t>\n                                                                                                </r>\n                                                                                        </text>\n                                                                                </comment>\n                                                                        </commentList>\n                                                                </comments>\n                                                                ')
    got = _xml_to_list(fh.getvalue())
    self.assertEqual(got, exp)
