PHPUnit assertNotSame() Function

The assertNotSame() function is a builtin function in PHPUnit and is used to assert the actually obtained value to be not-same to the expected value. This assertion will return true in the case if the expected value is not-same to actual value else returns false. In case of true the asserted test case got passed else test case got failed.

Syntax:

assertNotSame( mixed $expected, mixed $actual, string $message = '' )

Parameters: This function accepts three parameters as shown in the above syntax. The parameters are described below:

• $expected: This parameter is of any type which represents the expected data.
• $actual: This parameter is of any type which represents the actual data.
• $message: This parameter takes a string value. When the test case got failed this string message got displayed as an error message.

Below examples illustrate the assertNotSame() function in PHPUnit:

Example 1:

<?php 
use PHPUnit\Framework\TestCase; 
  
class GeeksPhpunitTestCase extends TestCase 
{ 
    public function testNegativeForassertNotSame()
        
    {
     $expected = "(108) mango";    
     $actual = "(108) mango";
        // Assert function to test whether expected
        // value is same as actual value or not
        $this->assertNotSame(
            $expected,
            $actual,
            "actual value is same to expected"
        );
        
    }
 
 } 
?> 

Output:

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

F                                                 1 / 1 (100%)

Time: 90 ms, Memory: 10.00 MB

There was 1 failure:

1) GeeksPhpunitTestCase::testNegativeForassertNotSame
actual value is same to expected
Failed asserting that two strings are not identical.

/home/lovely/Documents/php/test.php:17

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

Example 2:

<?php 
use PHPUnit\Framework\TestCase; 
  
class GeeksPhpunitTestCase extends TestCase 
{ 
    public function testPositiveForassertNotSame()
        
    {
     $expected = "(108) banana";    
     $actual = "(108) mango";
        // Assert function to test whether expected
        // value is same as actual value or not
        $this->assertNotSame(
            $expected,
            $actual,
            "actual value is same to expected"
        );
        
    }
 
 } 
?> 

Output:

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

.                                                  1 / 1 (100%)

Time: 90 ms, Memory: 10.00 MB

OK (1 test, 1 assertion)