code: def test_webagg_core_no_toolbar():
      fm = matplotlib.backends.backend_webagg_core.FigureManagerWebAgg
      assert fm._toolbar2_class is None
  
imports: import subprocess
  import os
  import sys
  import pytest
  import matplotlib.backends.backend_webagg_core
label_desc: Use image node_id 2 for calling a global function with example usage: test_webagg_core_no_toolbar() without return types