def test_list_file_history(self):
storage = RecipeStorage(TEST_DIRECTORY);
recipe = Recipe('MustikkaPiirakka.md', MARKDOWN)
storage.save(recipe)
storage.backup_recipe(recipe)
time.sleep(1)
storage.backup_recipe(recipe)
recipe=storage.load('MustikkaPiirakka.md')
recipes=storage.history(recipe)
self.assertEqual(len(recipes),2)
