Create and Unit test an Util class

Question

In my application I need to make advanced search against an equipements database, so i created this function in my service interface:

public List<Equipement> findByCriterias(SearchEquipement searchEquipement) ;

I thought that the best way to implement this function is, since I'm working with Spring MVC and Hibernate, to add a function to my DAO interface:

public List<Equipement> getByCriteria(org.hibernate.Criteria criteria) ;

in order to accomplish her mission the findByCriterias method needs to transform the searchEquipement to a org.hibernate.Criteria, so i decided to create an util class to do this (not complete yet) :

public class ApplicationUtil {

private ClassPathXmlApplicationContext context = new
    ClassPathXmlApplicationContext("mmapp/util/application-context-util.xml") ;

private SessionFactory sessionFactory ;

public void setSessionFactory(){
    sessionFactory = (SessionFactory) context.getBean("sessionFactory") ;
}

public synchronized Criteria changeSearchEquipementToCriteria(SearchEquipementsearchEquipement) {
    setSessionFactory() ;
    Criteria criteria = sessionFactory.getCurrentSession().createCriteria(Equipement.class) ;
    return criteria ;
}
}

the problem is when i tried to unit test this part, i have many troubles.

public class ApplicationUtilUnitTests {

    @Test
    public void testChangeSearchEquipementToCriteria(){
        ApplicationUtil util = new ApplicationUtil() ;
        Criteria criteria = util.changeSearchEquipementToCriteria(null) ;
        assertNotNull(criteria) ;
    }
}

that's after several other tries, now i get this error: org.hibernate.HibernateException: No Session found for current thread

score 0 · Answer 1 · edited May 23 '17 at 12:21

I believe your answer lies in this post. You're mixing Integration Testing with Unit Testing. By nature of your requirement what you can do is:

Use a mocking API such Mockito, PowerMock, EasyMock, or any one that suits you
Mock Hibernate's fundamental features such as SessionFactory, Session, and Criteria (e.g. this post)
Now, you can perform Unit Testing to verify your method is working properly

score 0 · Answer 2 · answered Jun 19 '12 at 01:04

Try this...

package com.om39a.spring.training.bean;

import org.hibernate.SessionFactory;
import org.hibernate.classic.Session;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.MockitoAnnotations;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
import org.powermock.reflect.Whitebox;

@RunWith(PowerMockRunner.class)
@PrepareForTest(ApplicationUtil.class)
public class ApplicationUtilTest {

    private ApplicationUtil applicationUtil;

    @Mock
    SessionFactory mockSessionFactory;

    @Mock
    Session mockSession;

    @Before
    public void init() {
        MockitoAnnotations.initMocks(this);
        applicationUtil = PowerMockito.spy(new ApplicationUtil());
    }

    @Test
    public void testApplicationUtil() throws Exception {
        Whitebox.setInternalState("sessionFactory", mockSession);
        PowerMockito.doNothing().when(applicationUtil, "setSessionFactory");
        Mockito.when(mockSessionFactory.getCurrentSession()).thenReturn(
                mockSession);
        applicationUtil.changeSearchEquipementToCriteria(null);
        /* ...
         * ...
         * ...
         * Assert statments goes here 
         * ...
         * ...
         * ...
         */
    }
}

Create and Unit test an Util class

2 Answers2