code: def test_init_spec_empty(self):
      self.assertEmpty(_BatchingTestModel.init_spec())
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from lit_nlp.api import dataset
  from lit_nlp.api import model
  from lit_nlp.api import types
label_desc: Use image node_id 3 for calling the ModelTest obj's underlying member method code with example usage: obj.test_init_spec_empty() without return types