code: def test_build_all_signature_defs_export_outputs_required(self):
      receiver_tensor = constant_op.constant(["11"])
  
      with self.assertRaises(ValueError) as e:
          export_utils.build_all_signature_defs(receiver_tensor, None)
  
      self.assertTrue(
          str(e.exception).startswith("`export_outputs` must be a dict")
      )
  
imports: import os
  import tempfile
  import time
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  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 math_ops
  from tensorflow.python.platform import test
  from tensorflow.python.saved_model import signature_constants
  from tensorflow.python.saved_model import signature_def_utils
  from tensorflow.python.saved_model.model_utils import export_output
  from tensorflow.python.saved_model.model_utils import export_utils
  from tensorflow.python.saved_model.model_utils.mode_keys import KerasModeKeys
label_desc: Use image node_id 4 for calling the ExportTest obj's underlying member method code with example usage: obj.test_build_all_signature_defs_export_outputs_required() without return types