PHPUnit assertFalse() Function

The assertFalse() function is a builtin function in PHPUnit and is used to assert the conditional value is true or false. This assertion will return true in the case if the conditional value is true else return false. In case of true the asserted test case got passed else test case got failed.

Syntax :

assertFalse(bool $condition[, string $message = ''])

Parameters: This function accepts two parameters as mentioned above and described below:

• $condition: This parameter is of any type of value that represents the true or false.
• $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 assertfalse() function in PHPUnit:Parameters:

Example 1:

PHP

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testNegativeTestcaseForassertFalse()
    {
        $condition = true;


        // Assert function to test whether
        // condition value is true or not
        $this->assertFalse(

            $condition,
            "condition is true or false"
        );
    }
}

?>

Output:

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

F                                                  1 / 1 (100%)

Time: 89 ms, Memory: 10.00 MB

There was 1 failure:

1) GeeksPhpunitTestCase::testPsitiveTestcaseForassertFalse
condition is true or false
Failed asserting that true is false.

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

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

Example 2:

PHP

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testPositiveTestcaseForassertFalse()
    {
        $condition = false;


        // Assert function to test whether
        // condition value is true or not
        $this->assertFalse(

            $condition,
            "condition is true or false"
        );
    }
}

?>

Output:

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

.                                                  1 / 1 (100%)

Time: 89 ms, Memory: 10.00 MB

OK (1 test, 1 assertion)

Reference:https://phpunit.readthedocs.io/en/9.2/assertions.html#assertfalse