code: def test_check_unknown(values, uniques, expected_diff, expected_mask):
      _assert_check_unknown(
          values, uniques, expected_diff, expected_mask
      )
  
file_path: scikit-learn/sklearn/utils/tests/test_encode.py
imports: import pickle
  import numpy
  import pytest
  from numpy.testing import assert_array_equal
  from sklearn.utils._encode import _check_unknown, _encode, _get_counts, _unique
label_desc: Use image node_id 4 for calling a global function with example usage: test_check_unknown(values, uniques, expected_diff, expected_mask) without return types