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