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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.assertEquals;
33  import static org.junit.Assert.assertNull;
34  
35  import org.junit.Test;
36  import org.sat4j.core.VecInt;
37  import org.sat4j.minisat.SolverFactory;
38  import org.sat4j.specs.ContradictionException;
39  import org.sat4j.specs.IConstr;
40  import org.sat4j.specs.ISolver;
41  import org.sat4j.specs.TimeoutException;
42  
43  public class BugSAT37 {
44  
45      @Test
46      public void testSolver() {
47          ISolver s = SolverFactory.newDefault();
48          int resVars = s.newVar(6);
49          assertEquals(6, resVars);
50          try {
51              s.addClause(new VecInt(new int[] { -1, -3 }));
52              s.addClause(new VecInt(new int[] { -2, -4 }));
53              s.addClause(new VecInt(new int[] { 1 }));
54              s.addClause(new VecInt(new int[] { 3 }));
55              IConstr r = s.addAtMost(new VecInt(new int[] { 5, 6 }), 1);
56              int[] model = s.findModel();
57              assertNull(model);
58              s.removeConstr(r);
59              model = s.findModel();
60              assertNull(model);
61          } catch (ContradictionException e) {
62              return;
63          } catch (TimeoutException e) {
64              return;
65          }
66      }
67  
68  }