TextfieldTest.php

<?php

namespace Drupal\Tests\Core\Render\Element;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Element\Textfield;
use Drupal\Tests\UnitTestCase;

/**
 * @coversDefaultClass \Drupal\Core\Render\Element\Textfield
 * @group Render
 */
class TextfieldTest extends UnitTestCase {
    
    /**
     * @covers ::valueCallback
     *
     * @dataProvider providerTestValueCallback
     */
    public function testValueCallback($expected, $input) {
        $element = [];
        $form_state = $this->prophesize(FormStateInterface::class)
            ->reveal();
        $this->assertSame($expected, Textfield::valueCallback($element, $input, $form_state));
    }
    
    /**
     * Data provider for testValueCallback().
     */
    public function providerTestValueCallback() {
        $data = [];
        $data[] = [
            NULL,
            FALSE,
        ];
        $data[] = [
            NULL,
            NULL,
        ];
        $data[] = [
            '',
            [
                'test',
            ],
        ];
        $data[] = [
            'test',
            'test',
        ];
        $data[] = [
            '123',
            123,
        ];
        $data[] = [
            'testwithnewline',
            "test\nwith\rnewline",
        ];
        return $data;
    }

}