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Program: How to do JUnit test for comapring two list of user defined objects?

Java Class: org.junit.Assert

Assert class provides a set of assertion methods useful for writing tests.

assertArrayEquals() method checks that two object arrays are equal or not. If they are not, it throws an AssertionError with the given message. Incase if expected input and actual inputs are null, then they are considered to be equal. It checks whether both arrays are having same number of elements or not, and all elements should be same. It compares based on the order. If mismatch in order results in failure. Incase of user defined objects, the objects should override equals() and hashCode() methods. Then assertArrayEquals() method called equals and hashCode methods to check the equality on each object.

package com.java2novice.junit.tests;

import static org.junit.Assert.*;
import org.junit.Before;
import org.junit.Test;

import com.java2novice.junit.samples.Employee;

public class MyArrayObjectEqualsTest {
        Object[] expectedEmps = new Object[3];
        public void initInputs(){
                expectedEmps[0] = new Employee(1, "Nats", 15000);
                expectedEmps[1] = new Employee(2, "Kalid", 25000);
                expectedEmps[2] = new Employee(3, "Krish", 5000);
        public void compareEmployees(){
                 * convert List of objects to array of objects
                Object[] testOutput = Employee.getEmpList().toArray();
                assertArrayEquals(expectedEmps, testOutput);

package com.java2novice.junit.samples;

import java.util.ArrayList;
import java.util.List;

public class Employee {

        private String name;
        private int empId;
        private int salary;
        public Employee(int id, String name, int sal){
                this.empId = id;
       = name;
                this.salary = sal;
        public boolean equals(Object obj){
                Employee emp = (Employee) obj;
                boolean status = false;
                                && this.empId == emp.empId 
                                && this.salary == emp.salary){
                        status = true;
                return status;
        public static List<Employee> getEmpList(){
                List<Employee> emps = new ArrayList<Employee>();
                emps.add(new Employee(1, "Nats", 15000));
                emps.add(new Employee(2, "Kalid", 25000));
                emps.add(new Employee(3, "Krish", 5000));
                return emps;
        public int hashCode(){
                return this.empId;
        public String getName() {
                return name;
        public void setName(String name) {
       = name;
        public int getEmpId() {
                return empId;
        public void setEmpId(int empId) {
                this.empId = empId;
        public int getSalary() {
                return salary;
        public void setSalary(int salary) {
                this.salary = salary;

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Java JUnit Examples

  1. Simple JUnit test using @Test annotation.
  2. List of JUnit annotations.
  3. Assertion method Assert.assertArrayEquals() example.
  4. How to do JUnit test for comapring two list of user defined objects?
  5. Assertion method Assert.assertEquals() example.
  6. Assertion method Assert.assertFalse() example.
  7. Assertion method Assert.assertTrue() example.
  8. Assertion method Assert.assertNotNull() example.
  9. Assertion method Assert.assertNull() example.
  10. Assertion method Assert.assertNotSame() example.
  11. Assertion method Assert.assertSame() example.
Knowledge Centre
Pass by value Vs Pass by reference
Pass by value: Passing a copy of the value, not the original reference.

Pass by reference: Passsing the address of the object, so that you can access the original object.
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Success consists of going from failure to failure without loss of enthusiasm.
-- Winston Churchill

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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