code: def test_empty_input(self):
      self._test("", "")
  
imports: import textwrap
  from tensorboard import context
  from tensorboard import plugin_util
  from tensorboard import test
  from tensorboard.backend import experiment_id
label_desc: Use image node_id 2 for calling the MarkdownToSafeHTMLTest obj's underlying member method code with example usage: obj.test_empty_input() without return types