code: def disconnect(self, *args, **kwargs):
      self.calls.append("disconnect")
  
file_path: pyqtgraph/tests/graphicsItems/test_AxisItem.py
imports: from math import isclose
  import pytest
  import pyqtgraph
label_desc: Use image node_id 3 for calling the FakeSignal obj's underlying member method code with example usage: obj.disconnect() without return types