code: def test_check_fh_empty_input(arg):
      """Test that fh validation throws an error with empty container."""
      with raises(ValueError, match="`fh` must not be empty"):
          check_fh(arg)
  
imports: import numpy
  import pandas
  import pytest
  from pytest import raises
  from sktime.utils.validation.forecasting import check_fh
label_desc: Use image node_id 1 for calling a global function with example usage: test_check_fh_empty_input(arg) without return types