code: def test_init_NA_encoder():
      """Test init method of NA_encoder class."""
      encoder = NA_encoder()
      assert encoder.numerical_strategy == "mean"
      assert encoder.categorical_strategy == "<NULL>"
      assert encoder._NA_encoder__Lcat == []
      assert encoder._NA_encoder__Lnum == []
      assert not encoder._NA_encoder__imp
      assert encoder._NA_encoder__mode == dict()
      assert not encoder._NA_encoder__fitOK
  
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 1 for calling a global function with example usage: test_init_NA_encoder() without return types