code: def test_artitificial_function_repr() -> None:
      config: tp.Dict[str, tp.Any] = {
          "name": "sphere",
          "block_dimension": 3,
          "useless_variables": 6,
          "num_blocks": 2,
      }
      func = functionlib.ArtificialFunction(**config)
      output = repr(func)
      assert "sphere" in output, f"Unexpected representation: {output}"
  
imports: import typing
  import numpy
  import pytest
  from nevergrad.common import testing
  from nevergrad.parametrization import parameter
  from .None import functionlib
label_desc: Use image node_id 2 for calling a global function with example usage: test_artitificial_function_repr() without return types