code: def test_display_html():
      html_content = "<p>hello world<p/>"
      obj = HTML(html_content)
      assert_equal(obj.data, html_content)
      assert_equal(obj.__html__(), html_content)
  
imports: from nose.tools import assert_equal, assert_in
  from pyecharts.render.display import HTML, Javascript
label_desc: Use image node_id 1 for calling a global function with example usage: test_display_html() without return types