PHPUnit assertIsScalar() Function

The assertIsScalar() function is a builtin function in PHPUnit and is used to assert Scalar variables are those containing an integer, float, string, or boolean. This function does not consider null to be scalar. This assertion will return true in the case if the actual value is scalar else returns false. In case of true the asserted test case got passed else test case got failed.

Syntax:

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

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

• $actual: This parameter is of any type string or variable which represent the actual data.
• $message: This parameter takes string value. When the test case got failed this string message got displayed as error message.

Below examples illustrate the assertIsScalar() function in PHPUnit:

Examples 1:

PHP

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testNegativeForassertIsScalar()
    {
     $actualvalue = Null;
        // Assert function to test whether actual
        // value is a scalar or not
        $this->assertIsScalar(

            $actualvalue,
            "actual value is a scalar or not"
        );

    }

 }
?>

Output:

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

F                                                  1 / 1 (100%)

Time: 88 ms, Memory: 10.00 MB

There was 1 failure:

1) GeeksPhpunitTestCase::testNegativeForassertIsScalar
actual value is a scalar or not
Failed asserting that null is of type "scalar".

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

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

Examples 2:

PHP

<?php
use PHPUnit\Framework\TestCase;

class GeeksPhpunitTestCase extends TestCase
{
    public function testPositiveForassertIsScalar()
    {
     $actualvalue = "Null";
        // Assert function to test whether actual
        // value is a any type of string or not
        $this->assertIsScalar(

            $actualvalue,
            "actual value is a scalar or not"
        );

    }


     public function testNegativeForassertIsScalar()
    {
     $actualvalue = 420;
            // Assert function to test whether actual
        // value is a integer or not
        $this->assertIsScalar(

            $actualvalue,
            "actual value is a scalar or not"
        );

    }

 }
?>

Output:

PHPUnit 8.5.8 by Sebastian Bergmann and contributors.

..                                                2 / 2 (100%)

Time: 90 ms, Memory: 10.00 MB

OK (2 tests, 2 assertions)

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