code: def test_scalar_search_wolfe2_with_low_amax(self):
      def phi(alpha):
          return (alpha - 5) ** 2
  
      def derphi(alpha):
          return 2 * (alpha - 5)
  
      s, _, _, _ = assert_warns(
          LineSearchWarning,
          ls.scalar_search_wolfe2,
          phi,
          derphi,
          amax=0.001,
      )
      assert_(s is None)
  
imports: from numpy.testing import assert_, assert_equal, assert_array_almost_equal, assert_array_almost_equal_nulp, assert_warns, suppress_warnings
  import scipy.optimize.linesearch
  from scipy.optimize.linesearch import LineSearchWarning
  import numpy
label_desc: Use image node_id 11 for calling the TestLineSearch obj's underlying member method code with example usage: obj.test_scalar_search_wolfe2_with_low_amax() and returns: unknown, unknown