code: def test__pow__(parameter):
      """Test the __pow__ magic method."""
      par, _ = parameter
      assert_allclose(par**0.5, 3.16227766)
      assert_allclose(par**4, 1e4)
  
imports: from math import trunc
  import pickle
  import numpy
  from numpy.testing import assert_allclose
  import pytest
  import lmfit
label_desc: Use image node_id 38 for calling a global function with example usage: test__pow__(parameter) without return types