old_contents: from os import listdir
  from pytest import fixture
  
  
  @fixture
  def cleansed_dropbox(dropbox_container, dropbox):
      """ TBD"""
      pass
  
  
  def test_initial_backup(dropbox_container, dropbox):
      assert 'dirty.zip.pgp' not in listdir(dropbox.fs_path)
      dropbox._create_backup()
      assert 'dirty.zip.pgp' in listdir(dropbox.fs_path)
  
  
  def test_initial_backup_removed_on_cleanup_after_success(dropbox_container, dropbox):
      dropbox._create_backup()
      assert 'dirty.zip.pgp' in listdir(dropbox.fs_path)
      dropbox.cleanup()
      assert 'dirty.zip.pgp' not in listdir(dropbox.fs_path)
  
new_contents: from os import listdir, mkdir
  from os.path import join
  from pytest import fixture
  
  
  @fixture
  def cleansed_dropbox(dropbox_container, dropbox):
      mkdir(join(dropbox.fs_path, 'clean'))
      return dropbox
  
  
  def test_cleanup_deletes_message(dropbox_container, dropbox):
      assert 'message' in listdir(dropbox.fs_path)
      dropbox.cleanup()
      assert 'message' not in listdir(dropbox.fs_path)
  
  
  def test_cleanup_deletes_dirty_attachments(dropbox_container, dropbox):
      assert 'attach' in listdir(dropbox.fs_path)
      dropbox.cleanup()
      assert 'attach' not in listdir(dropbox.fs_path)
  
  
  def test_cleanup_deletes_cleansed_attachments(dropbox_container, cleansed_dropbox):
      assert 'clean' in listdir(cleansed_dropbox.fs_path)
      cleansed_dropbox.cleanup()
      assert 'clean' not in listdir(cleansed_dropbox.fs_path)
  
  
  def test_initial_backup_creation(dropbox_container, dropbox):
      assert 'dirty.zip.pgp' not in listdir(dropbox.fs_path)
      dropbox._create_backup()
      assert 'dirty.zip.pgp' in listdir(dropbox.fs_path)
  
  
  def test_initial_backup_removed_on_cleanup(dropbox_container, dropbox):
      dropbox._create_backup()
      assert 'dirty.zip.pgp' in listdir(dropbox.fs_path)
      dropbox.cleanup()
      assert 'dirty.zip.pgp' not in listdir(dropbox.fs_path)
  
subject: add more cleanup assertions