'Include the unit header row'

def test_format3(self, table_type):

    self._setup(table_type)
    lines = self.tb.pformat(max_lines=8, max_width=40, show_unit=True)
    assert (lines == ['                col0                                    col1                ...            col19        ', '                km2                                                                        ...    kg    s    /    m2', '------------    -----------    ...    ---------', '0.000000e+00                1.000000    ...                        19.0', '                                    ...                                    ...    ...                            ...', '1.960000e+03    1961.000000    ...                1979.0', '1.980000e+03    1981.000000    ...                1999.0', 'Length    =    100    rows'])
