code: def test_l2_norm(
      data: dict, params: dict, expected: Union[float, dict, bool]
  ):
      out = l2_norm(a=data)
      assert out == expected, "Test failed."
  
file_path: Quantus/tests/functions/test_norm_func.py
imports: from typing import Union
  import pytest
  from pytest_lazyfixture import lazy_fixture
  from quantus.functions.norm_func import *
label_desc: Use image node_id 5 for calling a global function with example usage: test_l2_norm(data, params, expected) without return types