Hello Guys! Testing is a very most important part of any project. Without good testing, a good product is uncertain. We have different frameworks available for testing the product functionality. We have a good framework JUnit available in Java. Which can be configured with the project easily. I am writing this blog with the aim to explain how we can configure JUnit with a all-in-one framework Spring. Follow is the base class I love to create to load the spring application context and configure Spring to enable JUnit.

package com.multipli.base.dao;

import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class BaseDAOTest {

}

In the above class, I configured class SpringJUnit4ClassRunner to take authority to handle JUnit test cases. And loaded the spring application context from the class path in next line. Now we can have as many as classes extending it and having their own test cases as per the testing class. For example-

package com.multipli.dao.test;

import static org.junit.Assert.*;

import java.math.BigDecimal;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.annotation.Rollback;
import org.springframework.transaction.annotation.Transactional;
import org.junit.Test;

import com.evontech.base.dao.*;

public class PaymentDAOTest extends BaseDAOTest {

    @Autowired
    IPaymentDAO paymentDAO;

    @Test
    @Transactional
    public void testGetAll() {
        List<payment> payments = paymentDAO.getAll();
        System.out.println(payments);
    }

    @Test
    @Transactional
    public void testGetByLimits() {
        List<payment> payments = paymentDAO.getByLimits(1, 2);
        System.out.println(payments);
    }

    @Test
    @Transactional
    @Rollback(false)
    public void savePayment3() {

        Payment payment = new Payment();
        payment.setCanNumber("15019CLA02");
        payment.setGrpOrdRefNo(1109153003);     
        payment.setTransactionAmount(new BigDecimal(30000.00));

        assertNotNull(paymentDAO.save(payment));
    }

    @Test
    @Transactional
    public void testGetByCan() {
        String CAN = "15019CLA02";
        List<payment> payments = paymentDAO.getByCAN(CAN);
        System.out.println(payments);
    }

    @Test
    @Transactional
    public void testGetByFolio() {
        String folio = "DINESH1021";
        List<payment> payments = paymentDAO.getByFolio(folio);
        System.out.println(payments);
    }
}

In the above class, I have written the code to test a Payment DAO and its functionality.

Annotation @Test defines method as a test case for the class and annotation @Transactional defines transaction is transactional, means either the entire transaction will execute successfully or none.

Hope this would help you. Thanks. Happy Coding.