code: def test_default(self):
      X = self.X1
      X_copy = np.copy(X)
      Y = MinorityCoalescer().fit_transform(X)
      np.testing.assert_array_almost_equal(Y, X_copy)
      # Assert no copies were made
      self.assertEqual(id(X), id(Y))
  
file_path: auto-sklearn/test/test_pipeline/implementations/test_MinorityCoalescer.py
imports: import numpy
  import scipy.sparse
  from autosklearn.pipeline.implementations.MinorityCoalescer import MinorityCoalescer
  import unittest
label_desc: Use image node_id 3 for calling the MinorityCoalescerTest obj's underlying member method code with example usage: obj.test_default() without return types