code: def test_null_model_small_new():
      explainer = shap.explainers.SamplingExplainer(
          lambda x: np.zeros(x.shape[0]), np.ones((2, 4)), nsamples=100
      )
      shap_values = explainer(np.ones((1, 4)))
      assert np.sum(np.abs(shap_values.values)) < 1e-8
  
imports: import numpy
  import pytest
  import shap
label_desc: Use image node_id 2 for calling a global function with example usage: test_null_model_small_new() without return types