code: def test__rpow__(parameter):
      """Test the __rpow__ magic method."""
      par, _ = parameter
      assert_allclose(0.5**par, 0.0009765625)
      assert_allclose(4**par, 1048576)
  
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 51 for calling a global function with example usage: test__rpow__(parameter) without return types