code: def test_has_helper(self):
      self.assertTrue(brew.has_helper(brew.conv))
      self.assertTrue(brew.has_helper("conv"))
  
      def myhelper3():
          pass
  
      self.assertFalse(brew.has_helper(myhelper3))
  
imports: from caffe2.python import brew, core, scope, workspace
  from caffe2.python.modeling.parameter_info import ParameterTags
  from caffe2.python.model_helper import ModelHelper
  from caffe2.python.cnn import CNNModelHelper
  import unittest
  import numpy
label_desc: Use image node_id 11 for calling the BrewTest obj's underlying member method code with example usage: obj.test_has_helper() without return types