code: def test_additional_empty_response():
      with pytest.raises(
          ValueError,
          match="Additional formulas must contain a response name",
      ):
          bmb.Formula("y ~ x1", "x1")
  
file_path: bambi/tests/test_formula.py
imports: import pytest
  import bambi
label_desc: Use image node_id 2 for calling a global function with example usage: test_additional_empty_response() without return types