code: def test_fit(self):
      self.dummy_clf = Dummy2()
      assert_equal(self.dummy_clf.fit(0), 0)
  
imports: from __future__ import division
  from __future__ import print_function
  import os
  import sys
  import unittest
  import numpy
  from numpy.testing import assert_equal
  from numpy.testing import assert_raises
  from pyod.models.base import BaseDetector
  from pyod.utils.data import generate_data
label_desc: Use image node_id 3 for calling the TestBASE obj's underlying member method code with example usage: obj.test_fit() without return types