code: def test_handle_node_marker(self) -> None:
      kw = bpg.get_graph_kwargs({}, {}, node_marker="x")
      node_glyph = kw["node_renderer"].glyph
      assert (
          isinstance(node_glyph, Scatter) and node_glyph.marker == "x"
      )
  
file_path: bokeh/tests/unit/bokeh/plotting/test__graph.py
imports: from __future__ import annotations
  import pytest
  import pandas
  from bokeh.core.properties import field
  from bokeh.models import ColumnDataSource, MultiLine, Scatter
  import bokeh.plotting._graph
label_desc: Use image node_id 4 for calling the Test_get_graph_kwargs obj's underlying member method code with example usage: obj.test_handle_node_marker() without return types