code: def slotReceive(self):
      self.counter += 1
  
file_path: pyqtgraph/tests/test_signalproxy.py
imports: import pytest
  from pyqtgraph import SignalProxy
  from pyqtgraph.Qt import QtCore, mkQApp
label_desc: Use image node_id 2 for calling the Receiver obj's underlying member method code with example usage: obj.slotReceive() without return types