code: def test_linreg_metrics(precalculated_linear_regression_explainer):
      assert isinstance(
          precalculated_linear_regression_explainer.metrics(), dict
      )
      assert isinstance(
          precalculated_linear_regression_explainer.metrics_descriptions(),
          dict,
      )
  
imports: import pytest
  import pandas
  import numpy
  import shap
  import plotly.graph_objects
label_desc: Use image node_id 7 for calling a global function with example usage: test_linreg_metrics(precalculated_linear_regression_explainer) without return types