old_contents: 
  import logging
  import os.path
  import shutil
  import sys
  import tempfile
  
  import fiona
  
  def test_options(tmpdir=None):
      """Test that setting CPL_DEBUG=ON works"""
      if tmpdir is None:
          tempdir = tempfile.mkdtemp()
          logfile = os.path.join(tempdir, 'example.log')
      else:
          logfile = str(tmpdir.join('example.log'))
      logger = logging.getLogger('Fiona')
      logger.setLevel(logging.DEBUG)
      fh = logging.FileHandler(logfile)
      fh.setLevel(logging.DEBUG)
      logger.addHandler(fh)
  
      with fiona.drivers(CPL_DEBUG=True):
          c = fiona.open("docs/data/test_uk.shp")
          c.close()
          log = open(logfile).read()
          assert "OGR Error 0: OGR: OGROpen(docs/data/test_uk.shp" in log
  
      if tempdir and tmpdir is None:
          shutil.rmtree(tempdir)
  
new_contents: 
  import logging
  import os.path
  import shutil
  import sys
  import tempfile
  
  import fiona
  
  def test_options(tmpdir=None):
      """Test that setting CPL_DEBUG=ON works"""
      if tmpdir is None:
          tempdir = tempfile.mkdtemp()
          logfile = os.path.join(tempdir, 'example.log')
      else:
          logfile = str(tmpdir.join('example.log'))
      logger = logging.getLogger('Fiona')
      logger.setLevel(logging.DEBUG)
      fh = logging.FileHandler(logfile)
      fh.setLevel(logging.DEBUG)
      logger.addHandler(fh)
  
      with fiona.drivers(CPL_DEBUG=True):
          c = fiona.open("docs/data/test_uk.shp")
          c.close()
          log = open(logfile).read()
          assert "Option CPL_DEBUG" in log
  
      if tempdir and tmpdir is None:
          shutil.rmtree(tempdir)
  
subject: Test log for a string with no "'b"