code: def test_uses_separator_invalid_type():
      with pytest.raises(AssertionError):
          USESSeparator(input_dim=None, ch_mode="fff")
  
imports: import pytest
  import torch
  from torch_complex import ComplexTensor
  from espnet2.enh.separator.uses_separator import USESSeparator
label_desc: Use image node_id 3 for calling a global function with example usage: test_uses_separator_invalid_type() without return types