code: def test_get_method(self):
      obj = activations.get("relu")
      self.assertEqual(obj, activations.relu)
  
      obj = activations.get(None)
      self.assertEqual(obj, activations.linear)
  
      with self.assertRaises(ValueError):
          activations.get("typo")
  
imports: import numpy
  from keras import activations
  from keras import backend
  from keras import testing
label_desc: Use image node_id 39 for calling the ActivationsTest obj's underlying member method code with example usage: obj.test_get_method() without return types