使用JUnit4测试Spring

测试DAO

 import static org.junit.Assert.*;

 import org.junit.Before;
 import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import javax.annotation.Resource;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.transaction.TransactionConfiguration;
 import org.springframework.transaction.annotation.Transactional;

 @Transactional
 @TransactionConfiguration(transactionManager = "txManager", defaultRollback = true)
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration(locations={"classpath:spring-dao-test.xml","classpath:spring-service-test.xml"})
 public class SpringTest
 {
     @Resource(name="testDao")
     private TestDao testDao;

     @Before
     public void setUp() throws Exception
     {
     }

     @Test
     public void testMyDao()
     {
         try
         {
             testDao.doSomething();
         }
         catch (Exception e)
         {
             fail("Test failed!");
         }
     }

     @Ignore
     public void testOtherSpringObject()
     {
         fail("Not yet implemented");
     }
 }

测试Spring的Controller

 import static org.junit.Assert.*;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import javax.annotation.Resource;
 import org.springframework.http.HttpMethod;
 import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.mock.web.MockHttpServletResponse;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.transaction.TransactionConfiguration;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.servlet.ModelAndView;

 @Transactional
 @TransactionConfiguration(transactionManager = "txManager", defaultRollback = true)
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration(locations={"classpath:spring-servlet.xml", "classpath:spring-dao-test.xml", "classpath:spring-service-test.xml"})
 public class CreateProductControllerTest
 {
     @Resource(name="/createProduct.htm")
     CreateProductController createProductController;

     private MockHttpServletRequest request;
   private MockHttpServletResponse response;

     @Before
     public void before()
     {
         request = new MockHttpServletRequest();
         response = new MockHttpServletResponse();
         request.setCharacterEncoding("UTF-8");
     }

     @Test
     public void testToSearchPage()
     {
         //request.setRequestURI("createProduct.htm");
         //request.setMethod(HttpMethod.POST.name());

         ModelAndView mv = null;
         try
         {
             mv = createProductController.toSearchPage(request, response);
         }
         catch (Exception e)
         {
             e.printStackTrace();
             fail("testToSearchPage failed!");
         }

         assertNotNull(mv);
         assertEquals(response.getStatus(), 200);
     }
 }

注意被测试对象在Spring中不能配置AOP切面代理，否则注入到TestCase时，会产生类型不匹配的异常。因为被代理后的类型发生了变化，注入到TestCase中时，与原始的类型有区别。

另外，运行TestCase时，可能需要加上两个jvm参数：

-Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl
-Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl