code: def test_str(self):
      m = ExampleModule()
      d = deferred.Deferred(lambda: m)
      self.assertEqual("Deferred(%s)" % m, str(d))
  
imports: from sonnet.src import base
  from sonnet.src import deferred
  from sonnet.src import test_utils
  import tensorflow
label_desc: Use image node_id 11 for calling the DeferredTest obj's underlying member method code with example usage: obj.test_str() without return types