code: def test_clear_in_step_mode():
      w = pg.PlotWidget()
      c = pg.PlotDataItem([1, 4, 2, 3], [5, 7, 6], stepMode="center")
      w.addItem(c)
      c.clear()
  
file_path: pyqtgraph/tests/graphicsItems/test_PlotDataItem.py
imports: import warnings
  import numpy
  import pyqtgraph
  from pyqtgraph.Qt import QtGui
label_desc: Use image node_id 8 for calling a global function with example usage: test_clear_in_step_mode() without return types