FilterArrayTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\Component\Utility;

use Drupal\Component\Utility\FilterArray;
use PHPUnit\Framework\TestCase;

/**
 * Test filter array functions.
 *
 * @group Utility
 *
 * @coversDefaultClass \Drupal\Component\Utility\FilterArray
 */
class FilterArrayTest extends TestCase {
    
    /**
     * Tests removing empty strings.
     *
     * @dataProvider providerRemoveEmptyStrings
     * @covers ::removeEmptyStrings
     */
    public function testRemoveEmptyStrings(array $values, array $expected) : void {
        $this->assertEquals($expected, array_values(FilterArray::removeEmptyStrings($values)));
    }
    
    /**
     * Data provider for testRemoveEmptyStrings().
     *
     * @see testRemoveEmptyStrings()
     */
    public static function providerRemoveEmptyStrings() : \Generator {
        (yield 'strings' => [
            [
                '',
                ' ',
                '0',
                'true',
                'false',
            ],
            [
                ' ',
                '0',
                'true',
                'false',
            ],
        ]);
        (yield 'integers' => [
            [
                -1,
                0,
                1,
            ],
            [
                -1,
                0,
                1,
            ],
        ]);
        (yield 'null, true, false' => [
            [
                NULL,
                TRUE,
                FALSE,
            ],
            [
                TRUE,
            ],
        ]);
        $stringable = new class  implements \Stringable {
            public function __toString() : string {
                return 'foo';
            }

};
        (yield 'non-scalar' => [
            [
                new $stringable(),
            ],
            [
                new $stringable(),
            ],
        ]);
    }

}