How to use the pylightxl.writexl.new_content_types_text function in pylightxl

db.add_ws('Sheet2', {})
        db.add_ws('Sheet3', {})
        db.add_ws('Sheet4', {})
        db.add_ws('Sheet5', {})
        db.add_ws('Sheet6', {})
        db.add_ws('Sheet7', {})
        db.add_ws('Sheet8', {})
        db.add_ws('Sheet9', {})
        db.add_ws('Sheet10', {})

        # test without and sharedStrings in db
        self.assertEqual(new_content_types_text(db), xml_base.format(many_tag_sheets=many_tag_sheets, tag_sharedStrings=''))

        # test with and sharedStrings in db
        db._sharedStrings = ['text']
        self.assertEqual(new_content_types_text(db), xml_base.format(many_tag_sheets=many_tag_sheets, tag_sharedStrings=xml_tag_sharedStrings))