old_contents: import unittest
  
  from onnx import defs, checker, helper
  
  
  class TestRelu(unittest.TestCase):
  
      def test_elu(self):
          self.assertTrue(defs.has('Elu'))
          node_def = helper.make_node(
              'Elu', ['X'], ['Y'], alpha=1.0)
          checker.check_node(node_def)
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import unittest
  
  from onnx import defs, checker, helper
  
  
  class TestRelu(unittest.TestCase):
  
      def test_elu(self):  # type: () -> None
          self.assertTrue(defs.has('Elu'))
          node_def = helper.make_node(
              'Elu', ['X'], ['Y'], alpha=1.0)
          checker.check_node(node_def)
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Add type hints to elu_test.py (#949)