old_contents: """A pytest plugin for using pyfakefs as a fixture
  
  When pyfakefs is installed, the "fs" fixture becomes available.
  
  :Usage:
  
  def my_fakefs_test(fs):
      fs.create_file('/var/data/xx1.txt')
      assert os.path.exists('/var/data/xx1.txt')
  """
  import py
  import pytest
  from pyfakefs.fake_filesystem_unittest import Patcher
  
  Patcher.SKIPMODULES.add(py)  # Ignore pytest components when faking filesystem
  
  
  @pytest.fixture
  def fs(request):
      """ Fake filesystem. """
      patcher = Patcher()
      patcher.setUp()
      request.addfinalizer(patcher.tearDown)
      return patcher.fs
  
new_contents: """A pytest plugin for using pyfakefs as a fixture
  
  When pyfakefs is installed, the "fs" fixture becomes available.
  
  :Usage:
  
  def my_fakefs_test(fs):
      fs.create_file('/var/data/xx1.txt')
      assert os.path.exists('/var/data/xx1.txt')
  """
  import linecache
  
  import py
  import pytest
  from pyfakefs.fake_filesystem_unittest import Patcher
  
  Patcher.SKIPMODULES.add(py)  # Ignore pytest components when faking filesystem
  Patcher.SKIPMODULES.add(linecache)  # Seems to be used by pytest internally
  
  
  @pytest.fixture
  def fs(request):
      """ Fake filesystem. """
      patcher = Patcher()
      patcher.setUp()
      request.addfinalizer(patcher.tearDown)
      return patcher.fs
  
subject: Add linecache module to skipped modules for pytest plugin