/*
 * Copyright 2009-2018 The VOTCA Development Team (http://www.votca.org)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
#define BOOST_TEST_MAIN

#define BOOST_TEST_MODULE trustregion_test
#include <boost/test/unit_test.hpp>
#include <votca/xtp/trustregion.h>
#include <iostream>

using namespace votca::xtp;
using namespace votca;
using namespace std;

BOOST_AUTO_TEST_SUITE(trustregion_test)

BOOST_AUTO_TEST_CASE(subproblem_test) {
  
Eigen::VectorXd gradient=Eigen::VectorXd::Zero(5);
gradient<<5.92833,9.88054,9.88054,9.88054,9.88054;
Eigen::MatrixXd hessian=Eigen::MatrixXd::Zero(5,5);
hessian<<1.0835,0.139166,0.139166,0.139166,0.139166,
0.139166,1.23194,0.231943,0.231943,0.231943,
0.139166,0.231943,1.23194,0.231943,0.231943,
0.139166,0.231943,0.231943,1.23194,0.231943,
0.139166,0.231943,0.231943,0.231943, 1.23194;

double radius=0.1;
TrustRegion trf;
Eigen::VectorXd newstep=trf.CalculateStep(gradient,hessian,radius);

bool equal=std::abs(newstep.norm()-radius)<1e-9;
if(!equal){
 std::cout<<"newstep_norm:"<<newstep.norm()<<" trust_radius:"<<radius<<std::endl; 
}
  
  
  BOOST_CHECK_EQUAL(equal, 1);
  
  
}



BOOST_AUTO_TEST_SUITE_END()