/*

  * Žluťoučký kůň je naše hříbátko.

  * and open the template in the editor.

  */

 package api;

 import junit.framework.TestCase;

 /**

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 public class FactorialTest extends TestCase {

     public FactorialTest(String testName) {

         super(testName);

     }            

     @Override

     protected void setUp() throws Exception {

         super.setUp();

     }

     @Override

     protected void tearDown() throws Exception {

         super.tearDown();

     }

     public void testFactorial3() {

         assertEquals(6, Factorial.factorial(3));

     }

     public void testFactorial4() {

         assertEquals(24, Factorial.factorial(4));

     }

     public void testFactorial5() {

         assertEquals(120, Factorial.factorial(5));

     }

     /** Class showing inventive, non-expected use of 

      * Arithmetica methods to do multiplication instead of

      * addition.

      */

     private static class Factorial extends Arithmetica {

         public static int factorial(int n) {

             return new Factorial().sumRange(1, n);

         }

         @Override

         public int sumTwo(int one, int second) {

             return one * second;

         }

     }

 }