RandomUtilTest.java

/*
 * $Id$
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package org.jcoderz.commons.util;

import junit.framework.TestCase;
import org.jcoderz.commons.ArgumentMalformedException;

/**
 * JUnit test for the class {@link org.jcoderz.commons.util.RandomUtil}.
 *
 * @author Michael Griffel
 */
public class RandomUtilTest
      extends TestCase
{
   /**
    * Tests the method {@link RandomUtil#random(long, long)}.
    */
   public void testRandom ()
   {
      randomValidArgsTest(0, 0);
      randomValidArgsTest(0, 1);
      randomValidArgsTest(0, Long.MAX_VALUE);
      randomValidArgsTest(Long.MIN_VALUE, Long.MAX_VALUE);

      randomInvalidArgsTest(1, 0);
      randomInvalidArgsTest(Long.MAX_VALUE, Long.MIN_VALUE);
      randomInvalidArgsTest(1, -1);
   }

   private void randomValidArgsTest (long min, long max)
   {
      final long random = RandomUtil.random(min, max);
      assertTrue("random value " + random
            + " must be >= min value " + min + ": ", random >= min);
      assertTrue("random value " + random
            + " must be <= max value " + max + ": ", random <= max);
   }

   private void randomInvalidArgsTest (long min, long max)
   {
      try
      {
         RandomUtil.random(min, max);
         fail("Expected ArgumentMalformedException for args: min="
               + min + ", max=" + max);
      }
      catch (ArgumentMalformedException expected)
      {
         // expected
      }
   }

}