new_contents: from __future__ import absolute_import, print_function, unicode_literals
  from builtins import dict, str
  from indra.databases import get_identifiers_url
  
  
  def test_chembl():
      cid = '1229517'
      assert get_identifiers_url('CHEMBL', cid) == \
          'http://identifiers.org/chembl.compound/CHEMBL%s' % cid
      assert get_identifiers_url('CHEMBL', 'CHEMBL%s' % cid) == \
          'http://identifiers.org/chembl.compound/CHEMBL%s' % cid
  
  
  def test_signor():
      sid = 'SIGNOR-PF15'
      assert get_identifiers_url('SIGNOR', sid) == \
          'https://signor.uniroma2.it/relation_result.php?id=%s' % sid
  
subject: Add some tests for db URLs