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 package org.apidesign.cloneproblem;

 import java.util.Date;

 import junit.framework.TestCase;

 /** The test as would be written by the (not paranoiac) API author.

  *

  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  */

 public class IntervalTest extends TestCase {

     public IntervalTest(String testName) {

         super(testName);

     }

     // BEGIN: interval.test

     public void testOneSecondInterval() {

         Date now = new Date();

         Date later = new Date(now.getTime() + 1000);

         Interval interval = new Interval(now, later);

         assertEquals("1s", 1000, interval.getLength());

     }

     // END: interval.test

     public void testLaterCantBeSooner() {

         Date now = new Date();

         Date later = new Date(now.getTime() - 1000);

         try {

             Interval interval = new Interval(now, later);

             fail("Shall throw IllegalArgumentException");

         } catch (IllegalArgumentException ex) {

             // OK

         }

     }

     public void testDoesNotThrowNPEOnSecondArg() {

         Date now = new Date();

         try {

             Interval interval = new Interval(now, null);

             fail("Shall throw IllegalArgumentException");

         } catch (IllegalArgumentException ex) {

             // OK

         }

     }

     public void testDoesNotThrowNPEOnFirstArg() {

         Date now = new Date();

         try {

             Interval interval = new Interval(null, now);

             fail("Shall throw IllegalArgumentException");

         } catch (IllegalArgumentException ex) {

             // OK

         }

     }

 }