code: def hlines(self, *args, **kwargs):
      # We can hack our assertion here since we always pass alpha=0.5
      for k, v in kwargs.items():
          setattr(self, k, v)
  
file_path: pmdarima/pmdarima/arima/tests/test_arima_diagnostics.py
imports: from pmdarima.datasets import load_lynx
  from pmdarima.arima import ARIMA
  from unittest.mock import patch
  import pytest
label_desc: Use image node_id 3 for calling the MockMPLAxis obj's underlying member method code with example usage: obj.hlines() without return types