def METHOD_NAME(self):
    """Test writing a worksheet with conditional formatting."""
    self.maxDiff = None
    fh = StringIO()
    worksheet = Worksheet()
    worksheet._set_filehandle(fh)
    worksheet.select()
    worksheet.index = 0
    worksheet.name = "Sheet1"
    worksheet.conditional_format(
        "A1",
        {
            "type": "data_bar",
            "data_bar_2010": True,
        },
    )
    worksheet.add_sparkline("A2", {"range": "Sheet1!B2"})
    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" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" mc:Ignorable="x14ac">
              <dimension ref="A1"/>
              <sheetViews>
                <sheetView tabSelected="1" workbookViewId="0"/>
              </sheetViews>
              <sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/>
              <sheetData/>
              <conditionalFormatting sqref="A1">
                <cfRule type="dataBar" priority="1">
                  <dataBar>
                    <cfvo type="min"/>
                    <cfvo type="max"/>
                    <color rgb="FF638EC6"/>
                  </dataBar>
                  <extLst>
                    <ext xmlns:x14="http://schemas.microsoft.com/office/spreadsheetml/2009/9/main" uri="{B025F937-C7B1-47D3-B67F-A62EFF666E3E}">
                      <x14:id>{DA7ABA51-AAAA-BBBB-0001-000000000001}</x14:id>
                    </ext>
                  </extLst>
                </cfRule>
              </conditionalFormatting>
              <pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/>
              <extLst>
                <ext xmlns:x14="http://schemas.microsoft.com/office/spreadsheetml/2009/9/main" uri="{78C0D931-6437-407d-A8EE-F0AAD7539E65}">
                  <x14:conditionalFormattings>
                    <x14:conditionalFormatting xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main">
                      <x14:cfRule type="dataBar" id="{DA7ABA51-AAAA-BBBB-0001-000000000001}">
                        <x14:dataBar minLength="0" maxLength="100" border="1" negativeBarBorderColorSameAsPositive="0">
                          <x14:cfvo type="autoMin"/>
                          <x14:cfvo type="autoMax"/>
                          <x14:borderColor rgb="FF638EC6"/>
                          <x14:negativeFillColor rgb="FFFF0000"/>
                          <x14:negativeBorderColor rgb="FFFF0000"/>
                          <x14:axisColor rgb="FF000000"/>
                        </x14:dataBar>
                      </x14:cfRule>
                      <xm:sqref>A1</xm:sqref>
                    </x14:conditionalFormatting>
                  </x14:conditionalFormattings>
                </ext>
                <ext xmlns:x14="http://schemas.microsoft.com/office/spreadsheetml/2009/9/main" uri="{05C60535-1F16-4fd2-B633-F4F36F0B64E0}">
                  <x14:sparklineGroups xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main">
                    <x14:sparklineGroup displayEmptyCellsAs="gap">
                      <x14:colorSeries theme="4" tint="-0.499984740745262"/>
                      <x14:colorNegative theme="5"/>
                      <x14:colorAxis rgb="FF000000"/>
                      <x14:colorMarkers theme="4" tint="-0.499984740745262"/>
                      <x14:colorFirst theme="4" tint="0.39997558519241921"/>
                      <x14:colorLast theme="4" tint="0.39997558519241921"/>
                      <x14:colorHigh theme="4"/>
                      <x14:colorLow theme="4"/>
                      <x14:sparklines>
                        <x14:sparkline>
                          <xm:f>Sheet1!B2</xm:f>
                          <xm:sqref>A2</xm:sqref>
                        </x14:sparkline>
                      </x14:sparklines>
                    </x14:sparklineGroup>
                  </x14:sparklineGroups>
                </ext>
              </extLst>
            </worksheet>
            """
    )
    got = _xml_to_list(fh.getvalue())
    self.assertEqual(got, exp)