code: def test_select_all(competences, expected, create_pool_classifiers):
      pool_classifiers = create_pool_classifiers
      dcs_test = BaseDCS(pool_classifiers, selection_method="all")
      selected_clf = dcs_test.select(np.array(competences))
      assert np.allclose(selected_clf, expected)
  
imports: from unittest.mock import MagicMock
  import numpy
  import pytest
  from deslib.dcs.base import BaseDCS
label_desc: Use image node_id 6 for calling a global function with example usage: test_select_all(competences, expected, create_pool_classifiers) without return types