磨蹭了很久，终于开始用UnitTest。原因一是和大家一样，不想晚上做噩梦，二是在Spring下对业务层TDD，能够不需要Tomcat，完全摆脱对显示层开发进度的依赖，而专注快速的开发业务层。
但是我们也只在业务层使用UnitTest，因为显示层至今没有什么好的UnitTest方法，而我们的业务逻辑又严格封装在业务层，Controler层只做个组装分派的基本动作，没必要花大力气去测试。
在Spring下的测试很简单，在Spring-mock.jar里有一个AbstractDependencyInjectionSpringContextTests，负责ApplicationContext的载入和属性的动态注入。（详看该类的JavaDoc)
所以，只要再写一个测试父类Extend它，用DbUnit负责测试前后的数据备份和恢复。子类就可以非常轻松，只需指定特定的Context文件路径, 通过成员变量配置以下数据备份和载入的策略,还有把需要注入的成员变量设为protected就可以了.
父类的源代码:
package com.itorgan.xxxx;
import org.dbunit.database.DatabaseConnection;
import org.dbunit.database.DatabaseSequenceFilter;
import org.dbunit.dataset.xml.XmlDataSet;
import org.dbunit.dataset.FilteredDataSet;
import org.dbunit.dataset.IDataSet;
import org.dbunit.dataset.filter.ITableFilter;
import org.dbunit.operation.DatabaseOperation;
import org.springframework.test.AbstractDependencyInjectionSpringContextTests;
import com.itorgan.util.DbUtil;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.File;
import java.util.ArrayList;
public class DAOTestCase extends AbstractDependencyInjectionSpringContextTests
{
protected ArrayList<String> contexts = null;
//DBUnit相关属性
protected DatabaseConnection dbunitConn = null;
/**
* 是否需要测试前备份
*/
protected boolean needBackup = false;
/**
* 是否需要在测试后重新载入刚才备份的数据
*/
protected boolean needRestore = false;
/**
* 备份文件的路径,
* 如果为空,默认为test/dbunitData/myTestData.xml/
*/
protected String xmlFilePath = null;
/**
* 需要备份的数据库Table名
*/
protected String[] tableNames = null;
public DAOTestCase()
{
//设了这个,就能autowire by name,否则by setter.
setPopulateProtectedVariables(true);
contexts = new ArrayList<String>();
contexts.add("/applicationContext-Hibernate.xml");
contexts.add("/applicationContext-SetupService.xml");
}
public String[] getConfigLocations()
{
String[] tmp = new String[contexts.size()];
return contexts.toArray(tmp);
}
public void onSetUp() throws Exception
{
if (needBackup)
{
DbUtil dbUtil = new DbUtil(applicationContext);
dbunitConn = new DatabaseConnection(dbUtil.getConn(), "LH");
if (xmlFilePath == null)
xmlFilePath = "test/dbunitData/myTestData.xml";
if (tableNames != null)
{
ITableFilter filter = new DatabaseSequenceFilter(dbunitConn, tableNames);
IDataSet dataset = new FilteredDataSet(filter, dbunitConn.createDataSet());
File f_file = new File(xmlFilePath);
new File(f_file.getParent()).mkdirs();
XmlDataSet.write(dataset, new FileOutputStream(f_file));
}
else
{
throw new Exception("your choice backup data but no table names asign");
}
}
}
public void onTearDown() throws Exception
{
if (needRestore)
{
if (dbunitConn == null)
{
DbUtil dbUtil = new DbUtil(applicationContext);
dbunitConn = new DatabaseConnection(dbUtil.getConn(), "LH");
}
IDataSet dataSet = new XmlDataSet(new FileInputStream(xmlFilePath));
DatabaseOperation.REFRESH.execute(dbunitConn, dataSet);
}
dbunitConn.close();
}
}
子类的代码
package com.itorgan.xxx;
import com.itorgan.lherp.dao.CarDAO;
import junit.framework.Test;
import junit.framework.TestSuite;
public class CarDAOImplTest extends DAOTestCase
{
protected CarDAO carDAO; //声明为protected并且和Context,就会被动态注入
public void onSetUp() throws Exception
{
}
public void testGetGoodses() throws Exception
{
carDAO.getValidCars();
}
public static Test suite()
{
return new TestSuite(CarDAOImplTest.class);
}
}
