/*

 * 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.

     */

    //BEGIN: design.composition.arith.factorial

    public static final 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;

        }

    }

    //END: design.composition.arith.factorial

}