/*
    * Grapht, an open source dependency injector.
    * Copyright 2014-2015 various contributors (see CONTRIBUTORS.txt)
    * Copyright 2010-2014 Regents of the University of Minnesota
    *
    * This program is free software; you can redistribute it and/or modify
    * it under the terms of the GNU Lesser General Public License as
    * published by the Free Software Foundation; either version 2.1 of the
    * License, or (at your option) any later version.
   *
   * This program 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
   * this program; if not, write to the Free Software Foundation, Inc., 51
   * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   */
  package org.grouplens.grapht.solver;
  
  import org.grouplens.grapht.reflect.Desire;
  import org.grouplens.grapht.reflect.MockDesire;
  import org.junit.Test;
  
  import java.io.FileInputStream;
  import java.io.InputStream;
  import java.util.List;
  
  import static org.hamcrest.Matchers.*;
  import static org.junit.Assert.assertThat;
  
  /**
   * @author <a href="http://www.grouplens.org">GroupLens Research</a>
   */
  public class DesireChainTest {
      @Test
      public void testSingleDesire() {
          Desire desire = new MockDesire(String.class, null, null);
          DesireChain chain = DesireChain.singleton(desire);
          assertThat(chain.getCurrentDesire(),
                     equalTo(desire));
          assertThat(chain.getInitialDesire(),
                     equalTo(desire));
          assertThat(chain, contains(desire));
          assertThat(chain.getPreviousDesires(), hasSize(0));
      }
  
      @Test
      public void testMultipleDesires() {
          Desire d1 = new MockDesire(InputStream.class, null, null);
          Desire d2 = new MockDesire(FileInputStream.class, null, null);
          DesireChain chain = DesireChain.singleton(d1).extend(d2);
          assertThat(chain.getCurrentDesire(),
                     equalTo(d2));
          assertThat(chain.getInitialDesire(),
                     equalTo(d1));
          assertThat(chain.getPreviousDesires(),
                     equalTo((List<Desire>) DesireChain.singleton(d1)));
          assertThat(chain, contains(d1, d2));
      }
  }