docstr: Check if PreprocessingMissingValues object is properly initialized
docstr_tok: ["Check","if","PreprocessingMissingValues","object","is","properly","initialized"]
code: def test_preprocessing_constructor(self):
      """
      Check if PreprocessingMissingValues object is properly initialized
      """
      preprocess_missing = PreprocessingMissingValues(
          PreprocessingMissingValues.FILL_NA_MEDIAN
      )
      self.assertEqual(
          preprocess_missing._na_fill_method,
          PreprocessingMissingValues.FILL_NA_MEDIAN,
      )
      self.assertEqual(preprocess_missing._na_fill_params, {})
  
file_path: mljar-supervised/tests/tests_preprocessing/test_preprocessing_missing.py
imports: import unittest
  import tempfile
  import numpy
  import pandas
  from supervised.preprocessing.preprocessing_utils import PreprocessingUtils
  from supervised.preprocessing.preprocessing_missing import PreprocessingMissingValues
label_desc: Use image node_id 1 for calling the PreprocessingMissingValuesTest obj's underlying member method code with example usage: obj.test_preprocessing_constructor() without return types