购物车模块实例。购物车模块可以浏览商品类别；可以根据商品类别浏览商品信息；可以购买商品；可以查看购物车的商品；可以修改购买商品的数量和删除购买的商品。

				package junittest;
				
				import junit.framework.*;
				import data.*;
				
				public class TestNumberVerify extends TestCase {
				  private NumberVerify numberVerify = null;
				
				  protected void setUp() throws Exception {
				    super.setUp();
				    numberVerify = new NumberVerify();
				  }
				
				  protected void tearDown() throws Exception {
				    numberVerify = null;
				    super.tearDown();
				  }
				
				  public void testVerifyNum() {
				    String str = null;
				    boolean expectedReturn = false;
				    boolean actualReturn = numberVerify.verifyNum(str);
				    assertEquals("return value", expectedReturn, actualReturn);
				  }
				
				}