code: def test_init_with_no_arguments():
      mplw = MatplotlibWidget()
  
      assert_widget_fields(
          mplw, default_parent, default_figsize, default_dpi
      )
  
file_path: pyqtgraph/tests/widgets/test_matplotlibwidget.py
imports: from importlib.metadata import version
  import numpy
  import pytest
  import pyqtgraph
  from pyqtgraph.Qt import QtWidgets
  from pyqtgraph.widgets.MatplotlibWidget import MatplotlibWidget
label_desc: Use image node_id 4 for calling a global function with example usage: test_init_with_no_arguments() without return types