code: def test_njev(self):
      # test njev is returned correctly
      i = 1
      minimizer_kwargs = self.kwargs.copy()
      # L-BFGS-B doesn't use njev, but BFGS does
      minimizer_kwargs["method"] = "BFGS"
      res = basinhopping(
          func2d,
          self.x0[i],
          minimizer_kwargs=minimizer_kwargs,
          niter=self.niter,
          disp=self.disp,
      )
      assert_(res.nfev > 0)
      assert_equal(res.nfev, res.njev)
  
imports: import copy
  from numpy.testing import assert_almost_equal, assert_equal, assert_, assert_allclose
  import pytest
  from pytest import raises
  import numpy
  from numpy import cos, sin
  from scipy.optimize import basinhopping, OptimizeResult
  from scipy.optimize._basinhopping import Storage, RandomDisplacement, Metropolis, AdaptiveStepsize
label_desc: Use image node_id 6 for calling the TestBasinHopping obj's underlying member method code with example usage: obj.test_njev() without return types