code: def test_encoder_invalid_rel_pos_combination():
      with pytest.raises(AssertionError):
          ConformerEncoder(
              20,
              rel_pos_type="latest",
              pos_enc_layer_type="legacy_rel_pos",
              selfattention_layer_type="legacy_rel_sselfattn",
          )
      with pytest.raises(AssertionError):
          ConformerEncoder(
              20,
              pos_enc_layer_type="rel_pos",
              selfattention_layer_type="legacy_rel_sselfattn",
          )
      with pytest.raises(AssertionError):
          ConformerEncoder(
              20,
              pos_enc_layer_type="legacy_rel_pos",
              selfattention_layer_type="rel_sselfattn",
          )
  
file_path: espnet/test/espnet2/asr/encoder/test_conformer_encoder.py
imports: import pytest
  import torch
  from espnet2.asr.ctc import CTC
  from espnet2.asr.encoder.conformer_encoder import ConformerEncoder
label_desc: Use image node_id 3 for calling a global function with example usage: test_encoder_invalid_rel_pos_combination() without return types