code: def test_output(self):
      name = self.op_name.lower()
      self.expect(
          self.model, self.x, name=name, expected_num_initializers=0
      )
  
imports: import chainer
  import chainer.functions
  from chainer import testing
  from chainer.testing import attr
  import numpy
  import pytest
  from onnx_chainer.testing import input_generator
  from onnx_chainer_tests.helper import ONNXModelTest
label_desc: Use image node_id 2 for calling the TestTernaryMathOperators obj's underlying member method code with example usage: obj.test_output() without return types