针对GAE JPA服务方法运行JUnit测试

Question

我正在尝试编写并针对GAE JPA服务方法运行JUnit测试用例。我的GAE JPA服务方法如下所示：

import javax.persistence.EntityManager;
import javax.persistence.Query;

import com.wisegroup.dto.UserDto;
import com.wisegroup.entity.User;
import com.wisegroup.service.UserService;

public class UserServiceImpl implements UserService {


@Override
public boolean createUser(UserDto userDto) {

    EntityManager em = EMF.get().createEntityManager();

    try {
        User newUser =  new User();
        newUser.setUsername(userDto.getUsername());
        newUser.setPassword(userDto.getPassword());
        em.persist(newUser);
        em.close();
        return true;

    } catch(Exception ex){
        ex.printStackTrace();
        return false;
    }
}

@Override
public boolean loginUser(UserDto user) {        
    EntityManager em = EMF.get().createEntityManager();
    try{
        Query q = em.createQuery("select from User u where u.username =:username and u.password =:password");
        q.setParameter("username",user.getUsername());
        q.setParameter("password", user.getPassword());

        if(q.getResultList() !=null){
            return q.getResultList().size()>0;
        }
        else{
            return false;
        }
    }
    catch(Exception ex){
        ex.printStackTrace();
        return false;
    }


}

}

JUnit测试代码如下：

 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;

 import com.google.appengine.tools.development.testing.LocalDatastoreServiceTestConfig;
 import com.google.appengine.tools.development.testing.LocalServiceTestHelper;
 import com.wisegroup.dto.UserDto;
 import com.wisegroup.service.Impl.UserServiceImpl;

 public class UserServiceTest {

private final LocalServiceTestHelper helper =
        new LocalServiceTestHelper(new LocalDatastoreServiceTestConfig());
private static UserServiceImpl userService;

@Before
public void createUserService(){
    helper.setUp();
    userService = new UserServiceImpl();        
}

@Test
public void testloginUser(){

    UserDto userDto =new UserDto();
    userDto.setUsername("ramesh");
    userDto.setPassword("password");

    Assert.assertEquals("<< Logging in the User >>",true,userService.loginUser(userDto));
}

@Test
public void testcreateUser(){

    UserDto userDto =new UserDto();
    userDto.setUsername("ramesh1");
    userDto.setPassword("password");

    Assert.assertEquals("<< Creating the User >>",true,userService.createUser(userDto));
}


@After
public void tearDownService(){
    helper.tearDown();
    userService = null;
}
 }

但是当我尝试运行JUnit测试testcreateUser（）时，它会通过Assertion测试，但是当我使用以下url http://localhost:8888/_ah/admin查看本地数据存储区时，不会创建任何用户。没有创建实体。有人可以帮帮我吗？。