code: def test_adapter_fusion_save_with_head(self):
      # This test is not applicable to the encoder-decoder model since it has no heads.
      self.skipTest("Not applicable to the encoder-decoder model.")
  
imports: import unittest
  import adapters
  from hf_transformers.tests.models.encoder_decoder.test_modeling_encoder_decoder import *
  from transformers import AutoModelForSeq2SeqLM, AutoTokenizer, BertConfig
  from transformers.testing_utils import require_torch, torch_device
  from .methods import BottleneckAdapterTestMixin, CompacterTestMixin, IA3TestMixin, LoRATestMixin, PrefixTuningTestMixin, UniPELTTestMixin
  from .test_adapter import AdapterTestBase
  from .test_adapter_fusion_common import AdapterFusionModelTestMixin
label_desc: Use image node_id 3 for calling the EncoderDecoderAdapterTest obj's underlying member method code with example usage: obj.test_adapter_fusion_save_with_head() without return types