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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.pb;
31  
32  import static org.junit.Assert.assertEquals;
33  import static org.junit.Assert.assertFalse;
34  import static org.junit.Assert.assertTrue;
35  
36  import java.util.Collection;
37  
38  import org.junit.Test;
39  import org.sat4j.AbstractXplainTest;
40  import org.sat4j.core.VecInt;
41  import org.sat4j.specs.ContradictionException;
42  import org.sat4j.specs.IConstr;
43  import org.sat4j.specs.IVecInt;
44  import org.sat4j.specs.TimeoutException;
45  
46  public abstract class AbstractPBXplainTest extends
47          AbstractXplainTest<IPBSolver> {
48  
49      @Test
50      public void testExactlyConstraint() throws ContradictionException,
51              TimeoutException {
52          this.solver.newVar(4);
53          IVecInt clause = new VecInt();
54          clause.push(1).push(2).push(3).push(4);
55          IConstr c1 = this.solver.addExactly(clause, 1);
56          clause.clear();
57          clause.push(-1).push(2);
58          this.solver.addClause(clause);
59          clause.clear();
60          clause.push(-2).push(3);
61          this.solver.addClause(clause);
62          clause.clear();
63          clause.push(-3).push(4);
64          this.solver.addClause(clause);
65          clause.clear();
66          clause.push(-4).push(1);
67          this.solver.addClause(clause);
68          clause.clear();
69          assertFalse(this.solver.isSatisfiable());
70          Collection<IConstr> explanation = this.solver.explain();
71          assertEquals(5, explanation.size());
72          assertTrue(explanation.contains(c1));
73      }
74  }