old_contents: from textwrap import dedent
  
  from twisted.python.filepath import FilePath
  from twisted.trial.unittest import SynchronousTestCase
  
  from flocker import __version__ as version
  from flocker.common.version import get_installable_version
  from flocker.testtools import run_process
  
  
  class VersionExtensionsTest(SynchronousTestCase):
      """
      Tests for Sphinx version extensions.
      """
  
      def test_version_prompt(self):
          """
          The ``version-prompt`` directive replaces the placemarker
          ``|latest-installable|`` in a source file with the current
          installable version in the output file.
          """
          temp_dir = FilePath(self.mktemp())
          temp_dir.makedirs()
          source_file = temp_dir.child('contents.rst')
          source_file.setContent(dedent('''
              .. version-prompt:: bash $
  
                 $ PRE-|latest-installable|-POST
              '''))
          target = temp_dir.child('contents.html')
          run_process([
              'sphinx-build', '-b', 'html',
              '-C',   # don't look for config file, use -D flags instead
              '-D', 'extensions=flocker.docs.version_extensions',
              temp_dir.path,      # directory containing source/config files
              temp_dir.path,      # directory containing build files
              source_file.path])  # source file to process
          content = target.getContent()
          expected = 'PRE-{}-POST'.format(get_installable_version(version))
          self.assertIn(expected, content)
  
new_contents: from textwrap import dedent
  
  from twisted.python.filepath import FilePath
  from twisted.trial.unittest import SynchronousTestCase
  
  from flocker import __version__ as version
  from flocker.common.version import get_installable_version
  from flocker.testtools import run_process
  
  
  class VersionExtensionsTest(SynchronousTestCase):
      """
      Tests for Sphinx version extensions.
      """
  
      def test_version_prompt(self):
          """
          The ``version-prompt`` directive replaces the placemarker
          ``|latest-installable|`` in a source file with the current
          installable version in the output file.
          """
          temp_dir = FilePath(self.mktemp())
          temp_dir.makedirs()
          source_file = temp_dir.child('contents.rst')
          source_file.setContent(dedent('''
              .. version-prompt:: bash $
  
                 $ PRE-|latest-installable|-POST
              '''))
          run_process([
              'sphinx-build', '-b', 'html',
              '-C',   # don't look for config file, use -D flags instead
              '-D', 'extensions=flocker.docs.version_extensions',
              temp_dir.path,      # directory containing source/config files
              temp_dir.path,      # directory containing build files
              source_file.path])  # source file to process
          expected = 'PRE-{}-POST'.format(get_installable_version(version))
          content = temp_dir.child('contents.html').getContent()
          self.assertIn(expected, content)
  
subject: Remove unneeded variable from test.