def METHOD_NAME():
  """
  Test that MTRIX matrix is not applied if it is referred to as
  "given" and it is not under loop_.
  """
  inp = iotbx.pdb.input(lines=mmcif_str.split("\n"), source_info=None)
  #inp = iotbx.pdb.input('5aj2_test.cif')
  m = mmtbx.model.manager(model_input = inp,log = null_out())
  p = m.get_hierarchy()
  #p.overall_counts().show()
  chains = list(p.overall_counts().chain_ids.keys())
  chains.sort()
  answer = ['A', 'B', 'C']
  assert (chains == answer), '%s %s' % (chains, answer)