code: def test_infobox_content_atomic(self):
      test_content = "<h3>test-html-infobox</h3>"
      options = self._add_default_options(
          info_box_content=test_content, display_info_box=True
      )
      symbols = symbol_layer(self.locations, **options)
      for symbol in symbols.markers:
          assert symbol.info_box_content == test_content
          assert symbol.display_info_box
  
imports: import unittest
  import pytest
  import numpy
  import traitlets
  from ..marker import MarkerOptions, Marker, Markers, Symbol, marker_layer, symbol_layer
label_desc: Use image node_id 11 for calling the SymbolLayer obj's underlying member method code with example usage: obj.test_infobox_content_atomic() without return types