mathutilsunit.java

pastry的java实现的2.0b版

/*************************************************************************

"FreePastry" Peer-to-Peer Application Development Substrate 

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********************************************************************************/
/*
 *  Created on May 24, 2005
 *
 */
package rice.p2p.util.testing;

import rice.environment.random.RandomSource;
import rice.environment.random.simple.SimpleRandomSource;
import rice.p2p.util.MathUtils;

/**
 * MathUtils unit tests
 *
 * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
 * @author jstewart
 * @param argv The command line arguments
 */
public class MathUtilsUnit {

  /**
   * The main program for the MathUtilsUnit class
   *
   * @param args The command line arguments
   */
  public static void main(String[] args) {
    System.out.println("MathUtils Test Suite");
    System.out.println("-------------------------------------------------------------");
    System.out.println("  Running Tests");

    System.out.print("    Testing hexadecimal conversion\t\t\t");

    byte[] testHexBytes = new byte[]{(byte) 0xa7, (byte) 0xb3, (byte) 0x00, (byte) 0x12, (byte) 0x4e};
    String result = MathUtils.toHex(testHexBytes);

    if (result.equals("a7b300124e")) {
      System.out.println("[ PASSED ]");
    } else {
      System.out.println("[ FAILED ]");
      System.out.println("    Input: \t" + testHexBytes);
      System.out.println("    Output:\t" + result);
    }

    System.out.print("    Testing long conversion\t\t\t\t");
    long testLong = Long.parseLong("0123456789ABCDEF", 16);

    byte[] testLongByte = MathUtils.longToByteArray(testLong);

    if ((testLongByte[0] == (byte) 0x01) &&
      (testLongByte[1] == (byte) 0x23) &&
      (testLongByte[2] == (byte) 0x45) &&
      (testLongByte[3] == (byte) 0x67) &&
      (testLongByte[4] == (byte) 0x89) &&
      (testLongByte[5] == (byte) 0xAB) &&
      (testLongByte[6] == (byte) 0xCD) &&
      (testLongByte[7] == (byte) 0xEF)) {
      System.out.println("[ PASSED ]");
    } else {
      System.out.println("[ FAILED ]");
      System.out.println("    Input: \t" + testLong);
      System.out.println("    Output:\t" + testLongByte[0] + " " + testLongByte[1] + " " +
        testLongByte[2] + " " + testLongByte[3]);
    }

    System.out.print("    Testing int->byte[]->int conversion\t\t\t");

    RandomSource r = new SimpleRandomSource(null);
    boolean passed = true;

    for (int n = 0; n < 100000; n++) {
      int l = r.nextInt();
      byte[] ar = MathUtils.intToByteArray(l);
      int res = MathUtils.byteArrayToInt(ar);
      /*
       *  long l = r.nextLong();
       *  byte[] ar = longToByteArray(l);
       *  long result = byteArrayToLong(ar);
       */
      if (res != l) {
        passed = false;
        System.out.println("[ FAILED ]");
        System.out.println("input:  " + l);
        System.out.print("byte[]: ");
        for (int i = 0; i < ar.length; i++) {
          System.out.print(ar[i] + " ");
        }
        System.out.println();
        System.out.println("output: " + result);
        break;
      }
    }

    if (passed) {
      System.out.println("[ PASSED ]");
    }

    System.out.print("    Testing long->byte[]->long conversion\t\t\t");

    passed = true;

    for (int n = 0; n < 100000; n++) {
      long l = r.nextLong();
      byte[] ar = MathUtils.longToByteArray(l);
      long res = MathUtils.byteArrayToLong(ar);

      if (res != l) {
        passed = false;
        System.out.println("[ FAILED ]");
        System.out.println("input:  " + l);
        System.out.print("byte[]: ");
        for (int i = 0; i < ar.length; i++) {
          System.out.print(ar[i] + " ");
        }
        System.out.println();
        System.out.println("output: " + result);
        break;
      }
    }

    if (passed) {
      System.out.println("[ PASSED ]");
    }

    System.out.println("-------------------------------------------------------------");
  }
}