'Check that .data attribute preserves fill_value and mask'

def test_data_attribute_fill_and_mask(self):

    self.t['b'].fill_value = 1
    self.t['b'].mask = [True, False, True]
    assert (self.t['b'].data.fill_value == 1)
    assert np.all((self.t['b'].data.mask == [True, False, True]))
