package junit;

 public class Calculator2

 {

     private int add(int a, int b)

     {

         return a + b;

     }

 }

 package junit;

 import java.lang.reflect.Method;

 import junit.framework.Assert;

 import junit.framework.TestCase;

 /**

  * 测试私有方法，反射

  */

 public class Calculator2Test extends TestCase

 {

     public void testAdd()

     {

         try

         {

             Calculator2 cal2 = new Calculator2();

             Class<Calculator2> clazz = Calculator2.class;

             Method method = clazz.getDeclaredMethod("add", new Class[] {

                     Integer.TYPE, Integer.TYPE });

             method.setAccessible(true);

             Object result = method.invoke(cal2, new Object[] { 2, 3 });

             Assert.assertEquals(5, result);

         }

         catch (Exception ex)

         {

             Assert.fail();

         }

     }

 }