'Row stacking.'

def test_row_stacking(self):

    to_join = tablib.Dataset(headers=self.founders.headers)
    for row in self.founders:
        to_join.append(row=row)
    row_stacked = self.founders.stack(to_join)
    for column in row_stacked.headers:
        original_data = self.founders[column]
        expected_data = (original_data + original_data)
        self.assertEqual(row_stacked[column], expected_data)
