docstr: Tests the delegate creation and destruction.
docstr_tok: ["Tests","the","delegate","creation","and","destruction","."]
code: def testDelegate(self):
      """Tests the delegate creation and destruction."""
      interpreter = self._TestInterpreter(model_path=self._model_file)
      lib = interpreter._delegates[0]._library
  
      self.assertEqual(lib.get_num_delegates_created(), 1)
      self.assertEqual(lib.get_num_delegates_destroyed(), 0)
      self.assertEqual(lib.get_num_delegates_invoked(), 1)
  
      del interpreter
  
      self.assertEqual(lib.get_num_delegates_created(), 1)
      self.assertEqual(lib.get_num_delegates_destroyed(), 1)
      self.assertEqual(lib.get_num_delegates_invoked(), 1)
  
imports: import ctypes
  import io
  import sys
  from unittest import mock
  import numpy
  import tensorflow
  from tensorflow.lite.python import interpreter
  from tensorflow.lite.python.metrics import metrics
  from tensorflow.lite.python.testdata import _pywrap_test_registerer
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import resource_loader
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the InterpreterDelegateTest obj's underlying member method code with example usage: obj.testDelegate() without return types