code: def test_scalar_search_wolfe2(self, name):
      def bind_index(func, idx):
          # Remember Python's closure semantics!
          return lambda *a, **kw: func(*a, **kw)[idx]
  
      value = getattr(self, name)
      phi = bind_index(value, 0)
      derphi = bind_index(value, 1)
      for old_phi0 in self.rng().randn(3):
          res = line_search(phi, 0.0, 1.0)
          s, phi1, derphi1 = res.a_k, res.f_k, res.g_k
          self.assertAllClose(
              phi1, phi(s), check_dtypes=False, atol=1e-6
          )
          if derphi1 is not None:
              self.assertAllClose(
                  derphi1, derphi(s), check_dtypes=False, atol=1e-6
              )
          self.assert_wolfe(
              s, phi, derphi, err_msg=f"{name} {old_phi0:g}"
          )
  
imports: from absl.testing import absltest
  import scipy.optimize
  import jax
  from jax import grad
  from jax import config
  import jax.numpy
  import jax._src.test_util
  from jax._src.scipy.optimize.line_search import line_search
label_desc: Use image node_id 8 for calling the TestLineSearch obj's underlying member method code with example usage: obj.test_scalar_search_wolfe2(name) and returns: function