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import numpy as np
from radio_beam import Beam
from astropy.io import fits
from astropy import units as u
from .test_spectral_cube import cube_and_raw, path
from ..cube_utils import largest_beam, smallest_beam, beams_to_bintable
def test_largest_beam(data_522_delta_beams, use_dask):
cube, data = cube_and_raw(data_522_delta_beams, use_dask=use_dask)
large_beam = largest_beam(cube.beams)
assert large_beam == cube.beams[2]
def test_smallest_beam(data_522_delta_beams, use_dask):
cube, data = cube_and_raw(data_522_delta_beams, use_dask=use_dask)
small_beam = smallest_beam(cube.beams)
assert small_beam == cube.beams[0]
def test_beams_to_bintable_cube(data_522_delta_beams, use_dask):
cube, data = cube_and_raw(data_522_delta_beams, use_dask=use_dask)
hdul = fits.open(data_522_delta_beams)
beamtable = hdul[1]
bms = beams_to_bintable(cube.beams)
assert np.all(beamtable.data == bms.data)
assert bms.header['NPOL'] == 1
assert bms.header['NCHAN'] == 5
hdul.close()
def test_beams_to_bintable():
""" Check that NPOL is set """
beamlist = [Beam(1*u.arcsec)]*2
beamhdu = beams_to_bintable(beamlist)
assert beamhdu.header['NPOL'] == 0
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