'Test the _write_sheet_views() method with selection set'

def test_write_sheet_views6(self):

    self.worksheet.select()
    self.worksheet.set_selection('F4:D3')
    self.worksheet._write_sheet_views()
    exp = '<sheetViews><sheetView    tabSelected="1"    workbookViewId="0"><selection    activeCell="F4"    sqref="D3:F4"/></sheetView></sheetViews>'
    got = self.fh.getvalue()
    self.assertEqual(got, exp)
