class_docstr: Base class for the reference tests.
code: def test_return_with_default(self, n, type_):
      self.assertFunctionMatchesEager(return_with_default, type_(n))
  
imports: import itertools
  from absl.testing import parameterized
  import tensorflow
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 1 for calling the ReferenceTest obj's underlying member method code with example usage: obj.test_return_with_default(n, type_) without return types