old_contents: 
  import os
  import sphinx_tests_util
  from xml.etree import ElementTree
  from xml.dom import minidom
  
  
  # =============================================================================
  # Utility functions
  
  def srcdir(name):
      test_root = os.path.abspath(os.path.dirname(__file__))
      return os.path.join(test_root, "data", name)
  
  
  def pretty_print_xml(node):
      minidom_xml = minidom.parseString(ElementTree.tostring(node))
      output = minidom_xml.toprettyxml(indent="  ")
      lines = [line for line in output.splitlines() if line.strip()]
      print "\n".join(lines)
  
  
  def with_app(*args, **kwargs):
      kwargs = kwargs.copy()
      if "srcdir" in kwargs:
          kwargs["srcdir"] = srcdir(kwargs["srcdir"])
      return sphinx_tests_util.with_app(*args, **kwargs)
  
new_contents: 
  import os
  import sphinx_tests_util
  from xml.etree import ElementTree
  from xml.dom import minidom
  
  
  # =============================================================================
  # Utility functions
  
  def srcdir(name):
      test_root = os.path.abspath(os.path.dirname(__file__))
      return os.path.join(test_root, "data", name)
  
  
  def pretty_print_xml(node):
      minidom_xml = minidom.parseString(ElementTree.tostring(node))
      output = minidom_xml.toprettyxml(indent="  ")
      lines = [line for line in output.splitlines() if line.strip()]
      print "\n".join(lines)
  
  
  def with_app(*args, **kwargs):
      kwargs = kwargs.copy()
  
      # Expand test data directory.
      if "srcdir" in kwargs:
          kwargs["srcdir"] = srcdir(kwargs["srcdir"])
  
      # By default use a fresh build environment.
      if "freshenv" not in kwargs:
          kwargs["freshenv"] = True
  
      return sphinx_tests_util.with_app(*args, **kwargs)
  
subject: Use fresh build environment by default in tests