Junit: Assert object reference equality, not equality

Junit provides below methods to check whether two object references are point to same object or not.

static public void assertSame(String message, Object expected, Object actual)

Asserts that two objects refer to the same object. If the expected and actual are not pointing to same object, then junit throws AssertionError with given message.

static public void assertSame(Object expected, Object actual)

Asserts that two objects refer to the same object. If the expected and actual are not pointing to same object, then junit throws AssertionError without message.

static public void assertNotSame(String message, Object unexpected, Object actual)

Asserts that two objects are not referring to the same object. If the expected and actual are pointing to same object, then junit throws AssertionError with given message.

static public void assertNotSame(Object unexpected, Object actual)

Asserts that two objects are not referring to the same object. If the expected and actual are pointing to same object, then junit throws AssertionError without message.

Find the below working application.

DemoTestApp.java

package com.sample.arithmetic;

import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertSame;

import org.junit.Test;

public class DemoTestApp {

 private static class Employee {
  private int id;
  private String firstName;
  private String lastName;

  public Employee(int id, String firstName, String lastName) {
   this.id = id;
   this.firstName = firstName;
   this.lastName = lastName;
  }

  @Override
  public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + ((firstName == null) ? 0 : firstName.hashCode());
   result = prime * result + id;
   result = prime * result + ((lastName == null) ? 0 : lastName.hashCode());
   return result;
  }

  @Override
  public boolean equals(Object obj) {
   if (this == obj)
    return true;
   if (obj == null)
    return false;
   if (getClass() != obj.getClass())
    return false;
   Employee other = (Employee) obj;
   if (firstName == null) {
    if (other.firstName != null)
     return false;
   } else if (!firstName.equals(other.firstName))
    return false;
   if (id != other.id)
    return false;
   if (lastName == null) {
    if (other.lastName != null)
     return false;
   } else if (!lastName.equals(other.lastName))
    return false;
   return true;
  }

 }

 @Test
 public void testAssertSameWithMessage() {
  Employee emp1 = new Employee(1, "Krishna", "Gurram");
  Employee emp2 = emp1;

  assertSame("emp1 & emp2 are not pointing to same object", emp1, emp2);
 }

 @Test
 public void testAssertSameWithOutMessage() {
  Employee emp1 = new Employee(1, "Krishna", "Gurram");
  Employee emp2 = emp1;

  assertSame(emp1, emp2);
 }

 @Test
 public void testAssertNotSameWithMessage() {
  Employee emp1 = new Employee(1, "Krishna", "Gurram");
  Employee emp2 = new Employee(1, "Krishna", "Gurram");

  assertNotSame("emp1 & emp2 are pointing to same object", emp1, emp2);
 }

 @Test
 public void testAssertNotSameWithOutMessage() {
  Employee emp1 = new Employee(1, "Krishna", "Gurram");
  Employee emp2 = new Employee(1, "Krishna", "Gurram");

  assertNotSame(emp1, emp2);
 }

}

Previous                                                 Next                                                 Home