PHPUnit assertIsResource() Function

The assertIsResource() function is a builtin function in PHPUnit and is used to assert whether the given variable is Resource or not. This assertion will return true in the case if the given variable is Resource else returns false. In case of true the asserted test case got passed else test case got failed.

Syntax:

assertIsResource($actual[, $message = ''])

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

• $variable: This parameter is of any type of variable 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 assertIsResource() function in PHPUnit:

Example 1: 

PHP

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testNegativeTestcaseForassertIsResource()
    {
       $variable =  555;
        // Assert function to test whether assert
        //  variable is resource or not
        $this->assertIsResource(
            $variable,
            "assert variable is resource or not"
        );

    }

 }
?>

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::testNegativeTestcaseForassertIsResource
assert variable is resource or not
Failed asserting that 555 is of type "resource".

/home/lovely/Documents/php/test.php:14

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

Example 2:

PHP

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testPositiveTestcaseForassertIsResource()
    {
       $variable =  fopen('http://www.google.com','r');
        // Assert function to test whether assert
        //  variable is Iterable
        $this->assertIsResource(
            $variable,
            "assert variable is Iterable or not"
        );
       fclose($variable);

    }

 }
?>

Output:

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

.                                                 1 / 1 (100%)

Time: 613 ms, Memory: 10.00 MB

OK (1 test, 1 assertion)

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