code: def test__scale_parameters(self):
      trial = np.array([0.3])
      assert_equal(30, self.dummy_solver._scale_parameters(trial))
  
      # it should also work with the limits reversed
      self.dummy_solver.limits = np.array([[100], [0.0]])
      assert_equal(30, self.dummy_solver._scale_parameters(trial))
  
imports: import multiprocessing
  from scipy.optimize import _differentialevolution
  from scipy.optimize._differentialevolution import DifferentialEvolutionSolver
  from scipy.optimize import differential_evolution
  import numpy
  from scipy.optimize import rosen
  from numpy.testing import assert_equal, assert_allclose, assert_almost_equal, assert_string_equal, assert_
  from pytest import raises, warns
label_desc: Use image node_id 11 for calling the TestDifferentialEvolutionSolver obj's underlying member method code with example usage: obj.test__scale_parameters() without return types