'Column stacking'

def test_column_stacking(self):

    to_join = tablib.Dataset(headers=self.founders.headers)
    for row in self.founders:
        to_join.append(row=row)
    column_stacked = self.founders.stack_cols(to_join)
    for (index, row) in enumerate(column_stacked):
        original_data = self.founders[index]
        expected_data = (original_data + original_data)
        self.assertEqual(row, expected_data)
    self.assertEqual(column_stacked[0], ('John', 'Adams', 90, 'John', 'Adams', 90))
