code: def test_simple(self):
      inputs = ["0", "*1*", "**2**"]
      combine = lambda xs: "<br>".join(xs)
      actual = plugin_util.markdowns_to_safe_html(inputs, combine)
      expected = (
          "<p>0</p><br><p><em>1</em></p><br><p><strong>2</strong></p>"
      )
      self.assertEqual(actual, expected)
  
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 1 for calling the MarkdownsToSafeHTMLTest obj's underlying member method code with example usage: obj.test_simple() without return types