code: def test_scale():
      assert utils.scale(0, (0.0, 99.0), (-1.0, 1.0)) == -1.0
      assert utils.scale(-5, (0.0, 99.0), (-1.0, 1.0)) == -1.0
      assert utils.scale(105, (0.0, 99.0), (-1.0, 1.0)) == 1.0
      assert utils.scale(50, (0.0, 100.0), (-1.0, 1.0)) == 0.0
  
imports: import ffn.utils
label_desc: Use image node_id 6 for calling a global function with example usage: test_scale() without return types