code: def test_get_params_NA_encoder():
      """Test get_params method of NA_encoder class."""
      encoder = NA_encoder()
      dict = {
          "numerical_strategy": "mean",
          "categorical_strategy": "<NULL>",
      }
      assert encoder.get_params() == dict
  
file_path: MLBox/tests/test_na_encoder.py
imports: import pytest
  import pandas
  from mlbox.encoding.na_encoder import NA_encoder
label_desc: Use image node_id 2 for calling a global function with example usage: test_get_params_NA_encoder() without return types