def test_write_auto_filter_15(self):

        filter_condition = 'x >= 4000'
        exp = '<autoFilter ref="A1:D51"><filterColumn colId="2"><customFilters><customFilter operator="greaterThanOrEqual" val="4000"/></customFilters></filterColumn></autoFilter>'

        self.worksheet.filter_column('C', filter_condition)
        self.worksheet._write_auto_filter()

        got = self.fh.getvalue()

        self.assertEqual(got, exp)
Test the _write_auto_filter() method
dataset/ETHPy150Open jmcnamara/XlsxWriter/xlsxwriter/test/worksheet/test_write_auto_filter.py/TestWriteAutoFilter.test_write_auto_filter_15