code: def testWaitForSessionReturnsNoneAfterTimeout(self):
      with ops.Graph().as_default():
          variable_v1.VariableV1(1, name="v")
          sm = session_manager.SessionManager(
              ready_op=variables.report_uninitialized_variables(),
              recovery_wait_secs=1,
          )
  
          # Set max_wait_secs to allow us to try a few times.
          with self.assertRaises(errors.DeadlineExceededError):
              sm.wait_for_session(master="", max_wait_secs=3)
  
imports: import os
  from tensorflow.python.checkpoint import checkpoint_management
  from tensorflow.python.client import session
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import resource_variables_toggle
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.ops import variables
  from tensorflow.python.ops import while_loop
  from tensorflow.python.platform import gfile
  from tensorflow.python.platform import test
  from tensorflow.python.training import saver
  from tensorflow.python.training import server_lib
  from tensorflow.python.training import session_manager
label_desc: Use image node_id 9 for calling the SessionManagerTest obj's underlying member method code with example usage: obj.testWaitForSessionReturnsNoneAfterTimeout() without return types