Easily reproduce ASDF-in-FITS object for testing

asdf_in_fits.py

# coding: utf-8
from astropy.io import fits
from astropy.io.fits import HDUList, ImageHDU
from asdf.fits_embed import AsdfInFits
import numpy as np

get_ipython().run_line_magic('rm', '-f asdf.fits')

image = ImageHDU(np.random.random(1000))
hdulist = HDUList()
hdulist.append(image)

tree = {
'image': image.data
}

af = AsdfInFits(hdulist, tree)
af.write_to('asdf.fits')
hdu = hdulist[1]