'Show that the formatted output from str() works'

def test_format(self, Column):

    from ... import conf
    with conf.set_temp('max_lines', 8):
        c1 = Column(np.arange(2000), name='a', dtype=float, format='%6.2f')
        assert (str(c1).splitlines() == ['            a            ', '-------', '            0.00', '            1.00', '                ...', '1998.00', '1999.00', 'Length    =    2000    rows'])
