new_contents: from pybtex.database import BibliographyData
  from pybtex.core import Entry
  from pybtex.database.input.bibtex import Parser
  from cStringIO import StringIO
  
  test_data = [
      (
          '''
          ''',
          BibliographyData(),
      ),
      (
          '''@ARTICLE{
                  test,
                  title={Polluted
                      with {DDT}.
              },
          }''',
          BibliographyData({u'test': Entry('article', {u'title': 'Polluted with {DDT}.'})}),
      ),
  ]
  
  
  def _test(bibtex_input, correct_result):
      parser = Parser(encoding='UTF-8')
      parser.parse_stream(StringIO(bibtex_input))
      result = parser.data
      assert result == correct_result
  
  def test_bibtex_parser():
      for bibtex_input, correct_result in test_data:
          _test(bibtex_input, correct_result)
  
subject: Add a regression test for whitespace normalization in the BibTeX parser.