code: def test_get_method(self):
      metric = metrics_module.get("mse")
      self.assertIsInstance(metric, metrics_module.MeanSquaredError)
  
      metric = metrics_module.get("mean_squared_error")
      self.assertIsInstance(metric, metrics_module.MeanSquaredError)
  
      metric = metrics_module.get("categorical_accuracy")
      self.assertIsInstance(metric, metrics_module.CategoricalAccuracy)
  
      metric = metrics_module.get(None)
      self.assertEqual(metric, None)
  
      with self.assertRaises(ValueError):
          metrics_module.get("typo")
  
imports: import numpy
  from keras import backend
  from keras import initializers
  from keras import metrics
  from keras import ops
  from keras import testing
  from keras.metrics.metric import Metric
label_desc: Use image node_id 7 for calling the MetricTest obj's underlying member method code with example usage: obj.test_get_method() without return types