SizeTest.php

<?php

namespace Drupal\KernelTests\Core\Common;

use Drupal\Component\Utility\Bytes;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests format_size().
 *
 * @group Common
 */
class SizeTest extends KernelTestBase {
    
    /**
     * Checks that format_size() returns the expected string.
     *
     * @dataProvider providerTestCommonFormatSize
     */
    public function testCommonFormatSize($expected, $input) {
        $size = format_size($input, NULL);
        $this->assertEquals($expected, $size);
    }
    
    /**
     * Provides a list of byte size to test.
     */
    public function providerTestCommonFormatSize() {
        $kb = Bytes::KILOBYTE;
        return [
            [
                '0 bytes',
                0,
            ],
            [
                '1 byte',
                1,
            ],
            [
                '-1 bytes',
                -1,
            ],
            [
                '2 bytes',
                2,
            ],
            [
                '-2 bytes',
                -2,
            ],
            [
                '1023 bytes',
                $kb - 1,
            ],
            [
                '1 KB',
                $kb,
            ],
            [
                '1 MB',
                pow($kb, 2),
            ],
            [
                '1 GB',
                pow($kb, 3),
            ],
            [
                '1 TB',
                pow($kb, 4),
            ],
            [
                '1 PB',
                pow($kb, 5),
            ],
            [
                '1 EB',
                pow($kb, 6),
            ],
            [
                '1 ZB',
                pow($kb, 7),
            ],
            [
                '1 YB',
                pow($kb, 8),
            ],
            [
                '1024 YB',
                pow($kb, 9),
            ],
            // Rounded to 1 MB - not 1000 or 1024 kilobytes
[
                '1 MB',
                $kb * $kb - 1,
            ],
            [
                '-1 MB',
                -($kb * $kb - 1),
            ],
            // Decimal Megabytes
[
                '3.46 MB',
                3623651,
            ],
            [
                '3.77 GB',
                4053371676,
            ],
            // Decimal Petabytes
[
                '59.72 PB',
                67234178751368124,
            ],
            // Decimal Yottabytes
[
                '194.67 YB',
                2.3534682382112583E+26,
            ],
        ];
    }

}