PHPUnit assertFileNotExists() Function

The assertFileNotExists() function is a builtin function in PHPUnit and is used to assert whether a file exists at a given path or not. This assertion will return true in the case if the given file path doesn’t exist else return false. In case of true the asserted test case got passed else test case got failed.

Syntax:

assertFileNotExists(string $filename[, string $message = ''])

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

• $filename: This parameter is a string that denotes the File path.
• $message: This parameter takes a string value. When the test case got failed this string message got displayed as an error message.

Below programs illustrate the assertFileNotExists() function in PHPUnit:

Program 1:

PHP

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testNegativeTestcaseForAssertFileNotExists()
    {
        $filename = "/home/bittu/Documents/php/";

        // Assert function to test whether given
        // file name exists or not
        $this->assertFileNotExists(
            $filename,
            "filename exists at given path"
        );
    }
}

?>

Output:

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

F                                             1 / 1 (100%)

Time: 391 ms, Memory: 10.00 MB

There was 1 failure:

1) GeeksPhpunitTestCase::testNegativeTestcaseForAssertFileNotExists
filename exists at given path
Failed asserting that file "/home/bittu/Documents/php/" not exists.

/home/lovely/Documents/php/test.php:15

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

Program 2:

PHP

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testPositiveTestcaseForAssertFileNotExists()
    {
        $filename = "/home/Documents/geeksDoesNotExist/";

        // Assert function to test whether given
        // file name exists or not
        $this->assertFileNotExists(
            $filename,
            "filename exists"
        );
    }
}

?>

Output:

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

.                                             1 / 1 (100%)

Time: 88 ms, Memory: 10.00 MB

OK (1 test, 1 assertion)