PHPUnit | assertArrayHasKey() function

assertArrayHasKey(mixed $key, array $array[, string $message = ''])

1. $key: This parameter represents name of the key to be contained by array..
2. $array: This parameter is an array for whom the key is to be searched.
3. $message: This parameter takes string value. When the testcase got failed this string message got displayed as error message.

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testNegativeTestcaseForArrayHasKey()
    {
        // array to be tested
        $array  = array('geek' => 'geeksForgeeks', );
        // assert function to test whether 'geek' is a key of array
        $this->assertArrayHasKey('geeks', $array, "Array doesn't contains 'geeks' as key");
    }
}

?>

PHPUnit 6.5.5 by Sebastian Bergmann and contributors.

F                                                                   1 / 1 (100%)

Time: 108 ms, Memory: 4.00MB

There was 1 failure:

1) GeeksPhpunitTestCase::testNegativeTestcaseForArrayHasKey
Array doesn't contains 'geeks' as key
Failed asserting that an array has the key 'geeks'.

/home/shivam/Documents/geeks/phpunit/abc.php:9

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

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testPositiveTestcaseForArrayHasKey()
    {
        // array to be tested
        $array  = array('geeks' => 'geeksForgeeks', );
        // assert function to test whether 'geeks' is a key of array
        $this->assertArrayHasKey('geeks', $array, "Array doesn't contains 'geeks' as key");
    }
}

?>

PHPUnit 6.5.5 by Sebastian Bergmann and contributors.

.                                                                   1 / 1 (100%)

Time: 21 ms, Memory: 4.00MB

OK (1 test, 1 assertion)