'When table is not masked and trying to set mask on column then
it\'s Raise AttributeError.'

def test_mask_on_non_masked_table(self):

    t = table.Table([[1, 2], [3, 4]], names=('a', 'b'), dtype=('i4', 'f8'))
    with pytest.raises(AttributeError):
        t['a'].mask = [True, False]
