code: def test_infobox_default_display_lists(self):
      test_content = ["1", None]
      options = self._add_default_options(info_box_content=test_content)
      markers = marker_layer(self.locations, **options)
      display_infos = [
          marker.display_info_box for marker in markers.markers
      ]
      assert tuple(display_infos) == (True, False)
  
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 9 for calling the MarkerLayer obj's underlying member method code with example usage: obj.test_infobox_default_display_lists() without return types