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Program: Assertion method Assert.assertEquals() example.

Java Class: org.junit.Assert

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

Assert.assertEquals() methods checks that the two objects are equals or not. If they are not, an AssertionError without a message is thrown. Incase if both expected and actual values are null, then this method returns equal. In the below example, the first Test (mySimpleEqualsTest()) compares two strings. The second test (myObjectEqualsTest()) we are comparing two different user defined objects. The assertEquals() method calls equals method on each object to check equality.

package com.java2novice.junit.tests;

import org.junit.Test;

import com.java2novice.junit.samples.Employee;

import static org.junit.Assert.*;

public class MyAssertEqualsTest {

	public void mySimpleEqualsTest(){
		String expectedName = "Nattu";
		assertEquals(expectedName, Employee.getEmpNameWithHighestSalary());
	public void myObjectEqualsTest(){
		Employee expectedEmpObj = new Employee(1, "Nattu", 15000);
		assertEquals(expectedEmpObj, Employee.getHighestPaidEmployee());

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 String getEmpNameWithHighestSalary(){
		 * logic to get Highest paid employee
		return "Nattu";
	public static Employee getHighestPaidEmployee(){
		 * hiding logic to get highest paid employee
		return new Employee(1, "Nattu", 15000);
	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
Difference between super() and this()
super() is used to call super class constructor, whereas this() used to call constructors in the same class, means to call parameterized constructors.
Famous Quotations
Insanity: doing the same thing over and over again and expecting different results.
-- Albert Einstein

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