old_contents: from __future__ import absolute_import, print_function, unicode_literals
  from builtins import dict, str
  from indra.literature import crossref_client
  from indra.util import unicode_strs
  
  test_doi = '10.1016/j.ccell.2016.02.010'
  
  example_ids = {'pmid': '25361007',
                 'pmcid': 'PMC4322985',
                 'doi': '10.18632/oncotarget.2555'}
  def test_doi_query():
      mapped_doi = crossref_client.doi_query(example_ids['pmid'])
      assert mapped_doi == example_ids['doi']
      assert unicode_strs(mapped_doi)
  
  def test_get_metadata():
      metadata = crossref_client.get_metadata(test_doi)
      assert(metadata['DOI'] == test_doi)
      assert unicode_strs(metadata)
      metadata = crossref_client.get_metadata('xyz')
      assert(metadata is None)
  
  def test_get_publisher():
      publisher = crossref_client.get_publisher(test_doi)
      assert(publisher == 'Elsevier BV')
      assert unicode_strs(publisher)
      publisher = crossref_client.get_publisher('xyz')
      assert(publisher is None)
  
  def test_get_fulltext_links():
      links = crossref_client.get_fulltext_links(test_doi)
      assert(links[0]['content-type'] == 'text/plain')
      assert(links[1]['content-type'] == 'text/xml')
      assert unicode_strs(links)
      links = crossref_client.get_fulltext_links('xyz')
      assert(links is None)
  
  def test_get_license_links():
      links = crossref_client.get_license_links(test_doi)
      assert(links[0] == 'http://www.elsevier.com/tdm/userlicense/1.0/')
      assert unicode_strs(links)
      links = crossref_client.get_license_links('xyz')
      assert(links is None)
  
  def test_get_url():
      url = crossref_client.get_url(test_doi)
      assert url == 'http://dx.doi.org/10.1016/j.ccell.2016.02.010'
      assert unicode_strs(url)
      url = crossref_client.get_url('xyz')
      assert url is None
  
new_contents: from __future__ import absolute_import, print_function, unicode_literals
  from builtins import dict, str
  from indra.literature import crossref_client
  from indra.util import unicode_strs
  
  test_doi = '10.1016/j.ccell.2016.02.010'
  
  example_ids = {'pmid': '25361007',
                 'pmcid': 'PMC4322985',
                 'doi': '10.18632/oncotarget.2555'}
  def test_doi_query():
      mapped_doi = crossref_client.doi_query(example_ids['pmid'])
      assert mapped_doi == example_ids['doi']
      assert unicode_strs(mapped_doi)
  
  def test_get_metadata():
      metadata = crossref_client.get_metadata(test_doi)
      assert(metadata['DOI'] == test_doi)
      assert unicode_strs(metadata)
      metadata = crossref_client.get_metadata('xyz')
      assert(metadata is None)
  
  def test_get_publisher():
      publisher = crossref_client.get_publisher(test_doi)
      assert(publisher == 'Elsevier BV')
      assert unicode_strs(publisher)
      publisher = crossref_client.get_publisher('xyz')
      assert(publisher is None)
  
  def test_get_fulltext_links():
      links = crossref_client.get_fulltext_links(test_doi)
      content_types = [l.get('content-type') for l in links]
      assert('text/plain' in content_types)
      assert('text/xml' in content_types)
      assert unicode_strs(links)
      links = crossref_client.get_fulltext_links('xyz')
      assert(links is None)
  
  def test_get_license_links():
      links = crossref_client.get_license_links(test_doi)
      assert(links[0] == 'http://www.elsevier.com/tdm/userlicense/1.0/')
      assert unicode_strs(links)
      links = crossref_client.get_license_links('xyz')
      assert(links is None)
  
  def test_get_url():
      url = crossref_client.get_url(test_doi)
      assert url == 'http://dx.doi.org/10.1016/j.ccell.2016.02.010'
      assert unicode_strs(url)
      url = crossref_client.get_url('xyz')
      assert url is None
  
subject: Fix Crossref test link content types