code: def test_FeatureSetSelector_6():
      """Assert that the _get_support_mask function returns correct mask."""
      ds = FeatureSetSelector(
          subset_list="tests/subset_test.csv",
          sel_subset="test_subset_1",
      )
      ds.fit(test_X, y=None)
      mask = ds._get_support_mask()
      get_mask = ds.get_support()
  
      assert mask.shape[0] == 30
      assert np.count_nonzero(mask) == 5
      assert np.array_equal(get_mask, mask)
  
file_path: tpot/tests/feature_set_selector_tests.py
imports: import numpy
  import pandas
  from tpot.builtins import FeatureSetSelector
  from nose.tools import assert_raises
label_desc: Use image node_id 6 for calling a global function with example usage: test_FeatureSetSelector_6() without return types