src/tests/org/owasp/html/FuzzyTestCase.java

// Copyright (c) 2011, Mike Samuel
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
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// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// Neither the name of the OWASP nor the names of its contributors may
// be used to endorse or promote products derived from this software
// without specific prior written permission.
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package org.owasp.html;

import java.util.Random;

import junit.framework.TestCase;

/**
 * A testcase that has a random seed.
 * Subclasses are stochastic -- are not guaranteed to pass or fail consistently.
 * If you see a failure, please report it along with the seed from the output.
 * If you want to repeat a failure, set the system property "junit.seed".
 *
 * @author Mike Samuel <mikesamuel@gmail.com>
 */
abstract class FuzzyTestCase extends TestCase {

  protected long seed = System.currentTimeMillis();
  {
    String seedStr = System.getProperty("junit.seed");
    if (seedStr != null) {
      try {
        seed = Long.parseLong(seedStr);
      } catch (NumberFormatException ex) {
        ex.printStackTrace();
      }
    }
  }

  protected Random rnd;

  @Override protected void tearDown() throws Exception {
    super.tearDown();
    rnd = null;
  }

  @Override protected void setUp() throws Exception {
    super.setUp();
    rnd = new Random(seed);
  }
}