code: def test_output(self):
      self.expect(
          self.model,
          [self.x, self.gamma, self.beta, self.mean, self.var],
      )
  
imports: import chainer
  import chainer.functions
  import chainer.links
  from chainer import testing
  import numpy
  from onnx_chainer.testing import input_generator
  from onnx_chainer_tests.helper import get_initializer_names
  from onnx_chainer_tests.helper import ONNXModelTest
label_desc: Use image node_id 2 for calling the TestFixedBatchNormalizationFunctionExplicitInputs obj's underlying member method code with example usage: obj.test_output() without return types