code: def test_access_additional_names():
      f1 = bmb.Formula("y ~ x")
      f2 = bmb.Formula("y ~ x1", "sigma ~ 1", "gamma ~ x")
  
      assert f1.additionals_lhs == []
      assert f2.additionals_lhs == ["sigma", "gamma"]
  
file_path: bambi/tests/test_formula.py
imports: import pytest
  import bambi
label_desc: Use image node_id 4 for calling a global function with example usage: test_access_additional_names() without return types