code: def test_MLMDecoder_invalid_type():
      with pytest.raises(ValueError):
          MLMDecoder(10, 12, input_layer="foo")
  
imports: import pytest
  import torch
  from espnet2.asr.decoder.mlm_decoder import MLMDecoder
label_desc: Use image node_id 2 for calling a global function with example usage: test_MLMDecoder_invalid_type() without return types