def METHOD_NAME(self):
    """Test writing a worksheet with a blank cell with write() method."""
    self.maxDiff = None
    fh = StringIO()
    worksheet = Worksheet()
    worksheet._set_filehandle(fh)
    cell_format = Format({"xf_index": 1})
    # No format. Should be ignored.
    worksheet.write(0, 0, None)
    worksheet.write(1, 2, None, cell_format)
    worksheet.select()
    worksheet._assemble_xml_file()
    exp = _xml_to_list(
        """
            <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
            <worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">
              <dimension ref="C2"/>
              <sheetViews>
                <sheetView tabSelected="1" workbookViewId="0"/>
              </sheetViews>
              <sheetFormatPr defaultRowHeight="15"/>
              <sheetData>
                <row r="2" spans="3:3">
                  <c r="C2" s="1"/>
                </row>
              </sheetData>
              <pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/>
            </worksheet>
            """
    )
    got = _xml_to_list(fh.getvalue())
    self.assertEqual(got, exp)