/*
 * Project: MoleCuilder
 * Description: creates and alters molecular systems
 * Copyright (C)  2013 Frederik Heber. All rights reserved.
 * 
 *
 *   This file is part of MoleCuilder.
 *
 *    MoleCuilder is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    MoleCuilder is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with MoleCuilder.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * ConstantPotentialUnitTest.cpp
 *
 *  Created on: May 09, 2013
 *      Author: heber
 */

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

using namespace std;

#include <cppunit/CompilerOutputter.h>
#include <cppunit/extensions/TestFactoryRegistry.h>
#include <cppunit/ui/text/TestRunner.h>

#include "ConstantPotentialUnitTest.hpp"

#include <boost/assign.hpp>

#include "CodePatterns/Assert.hpp"

#include "FunctionApproximation/FunctionArgument.hpp"
#include "Potentials/Specifics/ConstantPotential.hpp"
#include "Potentials/helpers.hpp"

using namespace boost::assign;

#ifdef HAVE_TESTRUNNER
#include "UnitTestMain.hpp"
#endif /*HAVE_TESTRUNNER*/

/********************************************** Test classes **************************************/

// Registers the fixture into the 'registry'
CPPUNIT_TEST_SUITE_REGISTRATION( ConstantPotentialTest );

const double offset = 0.1;

void ConstantPotentialTest::setUp()
{
  // failing asserts should be thrown
  ASSERT_DO(Assert::Throw);
}


void ConstantPotentialTest::tearDown()
{
}

/** UnitTest for operator()
 */
void ConstantPotentialTest::operatorTest()
{
  ConstantPotential::ParticleTypes_t types;
  ConstantPotential constant(types, offset);
  CPPUNIT_ASSERT(
      Helpers::isEqual(
          offset,
          constant( FunctionModel::arguments_t() )[0]
      )
  );
}

/** UnitTest for derivative()
 */
void ConstantPotentialTest::derivativeTest()
{
  ConstantPotential::ParticleTypes_t types;
  ConstantPotential constant(types, offset);
  CPPUNIT_ASSERT(
      Helpers::isEqual(
          0.,
          constant.derivative(
              FunctionModel::arguments_t()
          )[0]
      )
  );
}


/** UnitTest for parameter_derivative()
 */
void ConstantPotentialTest::parameter_derivativeTest()
{
  ConstantPotential::ParticleTypes_t types;
  ConstantPotential constant(types, offset);
  CPPUNIT_ASSERT(
      Helpers::isEqual(
          1.,
          constant.parameter_derivative(
              FunctionModel::arguments_t(),
              0
          )[0]
      )
  );
}