gnu/testlet/java/math/BigInteger/divide.java

// Tags: JDK1.1

// Copyright (C) 2004 David Gilbert <david.gilbert@object-refinery.com>

// Mauve is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.

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// You should have received a copy of the GNU General Public License
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package gnu.testlet.java.math.BigInteger;

import gnu.testlet.TestHarness;
import gnu.testlet.Testlet;

import java.math.BigInteger;

/**
 * Some checks for the divide() method in the {@link BigInteger} class.
 */
public class divide implements Testlet 
{

  /**
   * Runs the test using the specified harness.
   * 
   * @param harness  the test harness (<code>null</code> not permitted).
   */
  public void test(TestHarness harness)   
  {
    // some really simple cases
    BigInteger p1 = new BigInteger("1");
    BigInteger p2 = new BigInteger("2");
    BigInteger p3 = new BigInteger("3");
    BigInteger p4 = new BigInteger("4");
    BigInteger m1 = new BigInteger("-1");
    BigInteger m2 = new BigInteger("-2");
    BigInteger m3 = new BigInteger("-3");
    BigInteger m4 = new BigInteger("-4");
    
    harness.check(p4.divide(p2).equals(p2));
    harness.check(m4.divide(p2).equals(m2));
    harness.check(p4.divide(m2).equals(m2));
    harness.check(m4.divide(m2).equals(p2));

    harness.check(p1.divide(p2).equals(BigInteger.ZERO));
    harness.check(m1.divide(p2).equals(BigInteger.ZERO));
    harness.check(p1.divide(m2).equals(BigInteger.ZERO));
    harness.check(m1.divide(m2).equals(BigInteger.ZERO));
    
    harness.check(p3.divide(p2).equals(BigInteger.ONE));
    harness.check(m3.divide(p2).equals(BigInteger.ONE.negate()));
    harness.check(p3.divide(m2).equals(BigInteger.ONE.negate()));
    harness.check(m3.divide(m2).equals(BigInteger.ONE));
   
    // some bigger numbers
    BigInteger bp1 = new BigInteger("12345678901234567890123456789012345678901234567890");
    BigInteger bp2 = new BigInteger("987654321098765432198765");
    BigInteger bm1 = new BigInteger("-12345678901234567890123456789012345678901234567890");
    BigInteger bm2 = new BigInteger("-987654321098765432198765");
    BigInteger resultp = new BigInteger("12499999886093750000298833");
    BigInteger resultm = new BigInteger("-12499999886093750000298833");
    
    harness.check(bp1.divide(bp2).equals(resultp));
    harness.check(bm1.divide(bp2).equals(resultm));
    harness.check(bp1.divide(bm2).equals(resultm));
    harness.check(bm1.divide(bm2).equals(resultp));

    // check null argument
    boolean pass = false;
    try 
    {
      p1.divide(null);
    }
    catch (NullPointerException e)
    {
      pass = true;
    }
    harness.check(pass);
    
    // check zero argument
    pass = false;
    try 
    {
      p1.divide(BigInteger.ZERO);    
    }
    catch (ArithmeticException e)  
    {
      pass = true;
    }
  }

}