def METHOD_NAME(self):
    """Test getting the radiances."""
    for ch in self.channels:
        if not is_vis_channel(ch):
            radiance = self.reader.get_dataset(
                key=make_dataid(name=ch, calibration='radiance'), info={})
            # ... this only compares the valid (unmasked) elements
            self.assertTrue(np.all(self.radiance == radiance.to_masked_array()),
                            msg='get_dataset() returns invalid radiance for '
                            'channel {}'.format(ch))