old_contents: from testtools import (
      TestCase,
      try_import,
  )
  
  from charmfixtures.filesystem import Filesystem
  from charmfixtures.users import Users
  from charmfixtures.groups import Groups
  from charmfixtures.hooktools.fixture import HookTools
  
  hookenv = try_import("from charmhelpers.core.hookenv")
  
  
  class CharmTest(TestCase):
  
      def setUp(self):
          super().setUp()
          self.filesystem = self.useFixture(Filesystem())
          self.users = self.useFixture(Users())
          self.groups = self.useFixture(Groups())
          self.hooktools = self.useFixture(HookTools())
          # If charmhelpers is around, clear its config cache
          hookenv and hookenv.cache.clear()
  
new_contents: from testtools import (
      TestCase,
      try_import,
  )
  
  from charmfixtures.filesystem import Filesystem
  from charmfixtures.users import Users
  from charmfixtures.groups import Groups
  from charmfixtures.hooktools.fixture import HookTools
  
  hookenv = try_import("charmhelpers.core.hookenv")
  
  
  class CharmTest(TestCase):
  
      def setUp(self):
          super().setUp()
          self.filesystem = self.useFixture(Filesystem())
          self.users = self.useFixture(Users())
          self.groups = self.useFixture(Groups())
          self.hooktools = self.useFixture(HookTools())
          # If charmhelpers is around, clear its config cache
          hookenv and hookenv.cache.clear()
  
subject: Fix import path