code: def test_forward(self):
      x, y = 10, 20
      expected_out = x + y
      forward_out = self.model(x, y)
      self.assertEqual(forward_out, expected_out)
  
file_path: PARL/parl/core/tests/model_base_test.py
imports: import unittest
  from parl.core.model_base import ModelBase
label_desc: Use image node_id 2 for calling the ModelBaseTest obj's underlying member method code with example usage: obj.test_forward() without return types