code: def test_standardize_lag_order_list_int():
      # List input, lags
      assert_equal(standardize_lag_order([]), 0)
      assert_equal(standardize_lag_order([1, 2]), 2)
      assert_equal(standardize_lag_order([1, 3]), [1, 3])
  
file_path: statsmodels/statsmodels/tsa/arima/tests/test_tools.py
imports: import numpy
  from numpy.testing import assert_equal, assert_raises
  from statsmodels.tsa.arima.tools import standardize_lag_order, validate_basic
label_desc: Use image node_id 2 for calling a global function with example usage: test_standardize_lag_order_list_int() without return types