message: Add the deprecation tag to self.test_session().
diff: @@ -70,6 +70,7 @@ from tensorflow.python.platform import googletest
  from tensorflow.python.platform import tf_logging as logging
  from tensorflow.python.training import server_lib
  from tensorflow.python.util import compat
  +from tensorflow.python.util import deprecation
  from tensorflow.python.util import memory
  from tensorflow.python.util import nest
  from tensorflow.python.util import tf_inspect
  @@ -1258,6 +1259,8 @@ class TensorFlowTestCase(googletest.TestCase):
  yield cached
  @contextlib.contextmanager
  + @deprecation.deprecated(None, "Use `self.session()` or "
  + "`self.cached_session()` instead.")
  def test_session(self,
  graph=None,
  config=None,
  