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1   /*******************************************************************************
2    * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
3    *
4    * All rights reserved. This program and the accompanying materials
5    * are made available under the terms of the Eclipse Public License v1.0
6    * which accompanies this distribution, and is available at
7    *  http://www.eclipse.org/legal/epl-v10.html
8    *
9    * Alternatively, the contents of this file may be used under the terms of
10   * either the GNU Lesser General Public License Version 2.1 or later (the
11   * "LGPL"), in which case the provisions of the LGPL are applicable instead
12   * of those above. If you wish to allow use of your version of this file only
13   * under the terms of the LGPL, and not to allow others to use your version of
14   * this file under the terms of the EPL, indicate your decision by deleting
15   * the provisions above and replace them with the notice and other provisions
16   * required by the LGPL. If you do not delete the provisions above, a recipient
17   * may use your version of this file under the terms of the EPL or the LGPL.
18   *
19   * Based on the original MiniSat specification from:
20   *
21   * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
22   * Sixth International Conference on Theory and Applications of Satisfiability
23   * Testing, LNCS 2919, pp 502-518, 2003.
24   *
25   * See www.minisat.se for the original solver in C++.
26   *
27   * Contributors:
28   *   CRIL - initial API and implementation
29   *******************************************************************************/
30  package org.sat4j.maxsat;
31  
32  import static org.junit.Assert.assertArrayEquals;
33  import static org.junit.Assert.assertEquals;
34  import static org.junit.Assert.assertNotNull;
35  import static org.junit.Assert.assertTrue;
36  import static org.junit.Assert.fail;
37  
38  import java.net.URL;
39  
40  import org.junit.Before;
41  import org.junit.Test;
42  import org.sat4j.maxsat.reader.WDimacsReader;
43  import org.sat4j.pb.PseudoOptDecorator;
44  import org.sat4j.specs.IOptimizationProblem;
45  import org.sat4j.specs.IProblem;
46  import org.sat4j.tools.OptToSatAdapter;
47  
48  public class MarcelBugsTests {
49  
50      private WeightedMaxSatDecorator maxsat;
51      private WDimacsReader reader;
52  
53      @Before
54      public void init() {
55          this.maxsat = new WeightedMaxSatDecorator(SolverFactory.newLight());
56          this.reader = new WDimacsReader(this.maxsat);
57      }
58  
59      @Test
60      public void testProblemWithDuplicatedOppositeLiterals2() {
61          testProblemWithExpectedAnswer("Inconsistent2.wcnf", new int[] { -1, 2,
62                  3 }, 5);
63      }
64  
65      @Test
66      public void testProblemWithDuplicatedOppositeLiterals1() {
67          testProblemWithExpectedAnswer("Inconsistent1.wcnf",
68                  new int[] { 1, 2, 3 }, 4);
69      }
70  
71      @Test
72      public void testSimpleProblemWithTwoOppositeLiterals() {
73          testProblemWithExpectedAnswer("Inconsistent_Example.wcnf",
74                  new int[] { -1 }, 1);
75      }
76  
77      @Test
78      public void testProblemWithNegatedLiterals() {
79          testProblemWithExpectedAnswer("Example.wcnf",
80                  new int[] { 1, 2, -3, 4 }, 0);
81      }
82  
83      @Test
84      public void testProblemWithDuplicatedLiterals() {
85          testProblemWithExpectedAnswer("AnotherExample.wcnf", new int[] { 1 }, 2);
86      }
87  
88      private void testProblemWithExpectedAnswer(String filename,
89              int[] expectation, int expectedValue) {
90          URL url = MarcelBugsTests.class.getResource(filename);
91          try {
92              IProblem problem = this.reader.parseInstance(url.getFile());
93              assertNotNull(problem);
94              IOptimizationProblem optproblem = new PseudoOptDecorator(
95                      this.maxsat);
96              IProblem satproblem = new OptToSatAdapter(optproblem);
97              assertTrue(satproblem.isSatisfiable());
98              int[] model = satproblem.model();
99              assertNotNull(model);
100             assertArrayEquals(expectation, model);
101             assertEquals(expectedValue, optproblem.getObjectiveValue()
102                     .intValue());
103 
104         } catch (Exception e) {
105             fail(" Problem when reading instance : " + e);
106         }
107     }
108 }