code: def test__mutate1(self):
      # strategies */1/*, i.e. rand/1/bin, best/1/exp, etc.
      result = np.array([0.05])
      trial = self.dummy_solver2._best1((2, 3, 4, 5, 6))
      assert_allclose(trial, result)
  
      result = np.array([0.25])
      trial = self.dummy_solver2._rand1((2, 3, 4, 5, 6))
      assert_allclose(trial, result)
  
imports: import multiprocessing
  import platform
  from scipy.optimize._differentialevolution import DifferentialEvolutionSolver, _ConstraintWrapper
  from scipy.optimize import differential_evolution
  from scipy.optimize._constraints import Bounds, NonlinearConstraint, LinearConstraint
  from scipy.optimize import rosen
  from scipy.sparse import csr_matrix
  from scipy._lib._pep440 import Version
  import numpy
  from numpy.testing import assert_equal, assert_allclose, assert_almost_equal, assert_array_equal, assert_string_equal, assert_, suppress_warnings
  from pytest import raises, warns
  import pytest
label_desc: Use image node_id 5 for calling the TestDifferentialEvolutionSolver obj's underlying member method code with example usage: obj.test__mutate1() without return types