new_contents: # Licensed under a 3-clause BSD style license - see LICENSE.rst
  """
  Accuracy tests for Ecliptic coordinate systems.
  """
  from __future__ import (absolute_import, division, print_function,
                          unicode_literals)
  
  from ....tests.helper import quantity_allclose
  from .... import units as u
  from ...builtin_frames import FK5, ICRS, GCRS, GeocentricTrueEcliptic, BarycentricTrueEcliptic, HeliocentricTrueEcliptic
  from ....constants import R_sun, R_earth
  
  
  def test_against_pytpm_doc_example():
      """
      Check that Astropy's Ecliptic systems give answers consistent with pyTPM
  
      Currently this is only testing against the example given in the pytpm docs
      """
      fk5_in = FK5('12h22m54.899s', '15d49m20.57s', equinox='J2000')
      pytpm_out = BarycentricTrueEcliptic(l=178.78256462*u.deg, b=16.7597002513*u.deg, equinox='J2000')
      astropy_out = fk5_in.transform_to(pytpm_out)
  
      # we check w/i 1 arcmin because there are some subtle differences in pyTPM's ecl definition
      assert pytpm_out.separation(astropy_out) < (1*u.arcmin)
  
  
  def test_ecliptic_heliobary():
      """
      Check that the ecliptic transformations for heliocentric and barycentric
      at least more or less make sense
      """
      icrs = ICRS(1*u.deg, 2*u.deg, distance=1.5*R_sun)
  
      bary = icrs.transform_to(BarycentricTrueEcliptic)
      helio = icrs.transform_to(HeliocentricTrueEcliptic)
  
      # make sure there's a sizable distance shift - in 3d hundreds of km, but
      # this is 1D so we allow it to be somewhat smaller
      assert np.abs(bary.distance - helio.distance) > 1*u.km
  
      # now make something that's got the location of helio but in bary's frame.
      # this is a convenience to allow `separation` to work as expected
      helio_in_bary_frame = bary.represent_as(helio.cartesian)
      assert bary.separation(helio_in_bary_frame) > 1*u.arcmin
  
  
  def test_ecl_geo():
      """
      Check that the geocentric version at least gets well away from GCRS.  For a
      true "accuracy" test we need a comparison dataset that is similar to the
      geocentric/GCRS comparison we want to do here.  Contributions welcome!
      """
      gcrs = GCRS(10*u.deg, 20*u.deg, distance=1.5*R_earth)
      gecl = gcrs.transform_to(GeocentricTrueEcliptic)
  
      assert quantity_allclose(gecl.distance, gcrs.distance)
  
subject: add tests for ecliptic frames