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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;
31  
32  import static org.junit.Assert.assertFalse;
33  import static org.junit.Assert.assertTrue;
34  
35  import org.junit.Before;
36  import org.junit.Test;
37  import org.sat4j.core.VecInt;
38  import org.sat4j.minisat.SolverFactory;
39  import org.sat4j.specs.ContradictionException;
40  import org.sat4j.specs.ISolver;
41  import org.sat4j.specs.TimeoutException;
42  
43  public class BugSAT17 {
44  
45      private ISolver solver;
46  
47      @Before
48      public void setup() throws ContradictionException {
49          this.solver = SolverFactory.newDefault();
50          this.solver.addClause(new VecInt(new int[] { 1 }));
51          this.solver.addClause(new VecInt(new int[] { 2 }));
52      }
53  
54      @Test
55      public void testAll() throws ContradictionException, TimeoutException {
56          assertFalse(this.solver.isSatisfiable(new VecInt(new int[] { -2 })));
57          assertFalse(this.solver.isSatisfiable(new VecInt(new int[] { 2, -2 })));
58          assertFalse(this.solver.isSatisfiable(new VecInt(new int[] { 1, -2 })));
59          assertTrue(this.solver.isSatisfiable(new VecInt(new int[] { 2, 1 })));
60      }
61  
62      @Test
63      public void testSingleLit() throws ContradictionException, TimeoutException {
64          assertFalse(this.solver.isSatisfiable(new VecInt(new int[] { -2 })));
65      }
66  
67      @Test
68      public void testInconsistentLits() throws ContradictionException,
69              TimeoutException {
70          assertFalse(this.solver.isSatisfiable(new VecInt(new int[] { 2, -2 })));
71      }
72  
73      @Test
74      public void testTwoLits() throws ContradictionException, TimeoutException {
75          assertFalse(this.solver.isSatisfiable(new VecInt(new int[] { 1, -2 })));
76      }
77  
78      @Test
79      public void testSameLits() throws ContradictionException, TimeoutException {
80          assertTrue(this.solver.isSatisfiable(new VecInt(new int[] { 2, 1 })));
81      }
82  
83      @Test
84      public void testOneSameOneContradictory() throws ContradictionException,
85              TimeoutException {
86          assertFalse(this.solver.isSatisfiable(new VecInt(new int[] { 2, -1 })));
87          assertFalse(this.solver.isSatisfiable(new VecInt(new int[] { -2 })));
88      }
89  
90  }