Java JUnit轻松模拟中的InvocationTargetException

使用

EasyMock

运行

JUnit

时，我遇到了一个问题。请在下面找到源文件-

UserTest.java

（JUnit文件）和

UserFinder.java

（要进行单元测试的应用程序文件）

UserTest.java

Class UserTest
{
  ...
  @Test
  public void testFindUserFunction() throws Exception {


    DAO daoMock = EasyMock.createMock(DAO.class);       
    User user = new User("john", "stephen", "city street", "bangalore");
    EasyMock.expect(daoMock.userExists(user).andReturn(true);
    EasyMock.replay(daoMock);       
    String userFirstName = user.getFirstName();
    User resultUser = UserFinder.findUser(userFirstName, daoMock);      
    PowerMock.verify(daoMock);      
    Assert.assertEquals(user, resultUser);
  }
}

Class UserFinder {
...
...
public User findUser(String userFirstName, DAO dao)
{
return dao.findUser(userFirstName);
}
...
...
}

UserFinder.java

Class UserTest
{
  ...
  @Test
  public void testFindUserFunction() throws Exception {


    DAO daoMock = EasyMock.createMock(DAO.class);       
    User user = new User("john", "stephen", "city street", "bangalore");
    EasyMock.expect(daoMock.userExists(user).andReturn(true);
    EasyMock.replay(daoMock);       
    String userFirstName = user.getFirstName();
    User resultUser = UserFinder.findUser(userFirstName, daoMock);      
    PowerMock.verify(daoMock);      
    Assert.assertEquals(user, resultUser);
  }
}

Class UserFinder {
...
...
public User findUser(String userFirstName, DAO dao)
{
return dao.findUser(userFirstName);
}
...
...
}

在JUnit中，我创建了一个mock对象

daoMock

，并在下面添加了

expect

行为

EasyMock.expect(daoMock.userExists(user).andReturn(true);

在下面的UserFinder.java行中，我需要传递

daoMock

，因为类已经存在并以这种方式设计。当通过JUnit执行下面一行时，我得到的是

java.lang.reflect.InvocationTargetException

User resultUser = UserFinder.findUser(userFirstName, daoMock);

---

我不熟悉

EasyMock

，我认为设置

expect

会增加

daoMock

对象的行为，但事实并非如此。请帮助我如何调用

dao.findUser

行，因为我不能模拟这行，因为它在应用程序文件中。如何在

EasyMock

中模拟并运行此案例的JUnit。谢谢。

你必须模仿这个方法

EasyMock.expect(dao.findUser(userFirstName).andReturn(user);

而不是

EasyMock.expect(daoMock.userExists(user)).andReturn(true);

---

谢谢。。斯特凡