code: def test_len(self):
      assert_equal(len(self.result), 3)
  
imports: import pytest
  import pickle
  from numpy.testing import assert_equal
  from scipy._lib._bunch import _make_tuple_bunch
label_desc: Use image node_id 6 for calling the TestMakeTupleBunch obj's underlying member method code with example usage: obj.test_len() without return types