FormElementsRenderTest.php

<?php

namespace Drupal\Tests\system\Kernel\Common;

use Drupal\Component\Render\FormattableMarkup;
use Drupal\Core\Url;
use Drupal\KernelTests\KernelTestBase;

/**
 * Performs integration tests on \Drupal::service('renderer')->render().
 *
 * @group system
 */
class FormElementsRenderTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'common_test',
        'system',
    ];
    
    /**
     * Tests rendering form elements without using doBuildForm().
     *
     * @see \Drupal\Core\Form\FormBuilderInterface::doBuildForm()
     */
    public function testDrupalRenderFormElements() {
        // Define a series of form elements.
        $element = [
            '#type' => 'button',
            '#value' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//input[@type=:type]', [
            ':type' => 'submit',
        ]);
        $element = [
            '#type' => 'textfield',
            '#title' => $this->randomMachineName(),
            '#value' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//input[@type=:type]', [
            ':type' => 'text',
        ]);
        $element = [
            '#type' => 'password',
            '#title' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//input[@type=:type]', [
            ':type' => 'password',
        ]);
        $element = [
            '#type' => 'textarea',
            '#title' => $this->randomMachineName(),
            '#value' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//textarea');
        $element = [
            '#type' => 'radio',
            '#title' => $this->randomMachineName(),
            '#value' => FALSE,
        ];
        $this->assertRenderedElement($element, '//input[@type=:type]', [
            ':type' => 'radio',
        ]);
        $element = [
            '#type' => 'checkbox',
            '#title' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//input[@type=:type]', [
            ':type' => 'checkbox',
        ]);
        $element = [
            '#type' => 'select',
            '#title' => $this->randomMachineName(),
            '#options' => [
                0 => $this->randomMachineName(),
                1 => $this->randomMachineName(),
            ],
        ];
        $this->assertRenderedElement($element, '//select');
        $element = [
            '#type' => 'file',
            '#title' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//input[@type=:type]', [
            ':type' => 'file',
        ]);
        $element = [
            '#type' => 'item',
            '#title' => $this->randomMachineName(),
            '#markup' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//div[contains(@class, :class) and contains(., :markup)]/label[contains(., :label)]', [
            ':class' => 'js-form-type-item',
            ':markup' => $element['#markup'],
            ':label' => $element['#title'],
        ]);
        $element = [
            '#type' => 'hidden',
            '#title' => $this->randomMachineName(),
            '#value' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//input[@type=:type]', [
            ':type' => 'hidden',
        ]);
        $element = [
            '#type' => 'link',
            '#title' => $this->randomMachineName(),
            '#url' => Url::fromRoute('common_test.destination'),
            '#options' => [
                'absolute' => TRUE,
            ],
        ];
        $this->assertRenderedElement($element, '//a[@href=:href and contains(., :title)]', [
            ':href' => URL::fromRoute('common_test.destination')->setAbsolute()
                ->toString(),
            ':title' => $element['#title'],
        ]);
        $element = [
            '#type' => 'details',
            '#open' => TRUE,
            '#title' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//details/summary[contains(., :title)]', [
            ':title' => $element['#title'],
        ]);
        $element = [
            '#type' => 'details',
            '#open' => TRUE,
            '#title' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//details');
        $element['item'] = [
            '#type' => 'item',
            '#title' => $this->randomMachineName(),
            '#markup' => $this->randomMachineName(),
        ];
        $this->assertRenderedElement($element, '//details/div[contains(@class, :class) and contains(., :markup)]', [
            ':class' => 'js-form-type-item',
            ':markup' => $element['item']['#markup'],
        ]);
    }
    
    /**
     * Tests that elements are rendered properly.
     *
     * @internal
     */
    protected function assertRenderedElement(array $element, string $xpath, array $xpath_args = []) : void {
        $this->render($element);
        $xpath = $this->buildXPathQuery($xpath, $xpath_args);
        $element += [
            '#value' => NULL,
        ];
        $this->assertFieldByXPath($xpath, $element['#value'], new FormattableMarkup('#type @type was properly rendered.', [
            '@type' => var_export($element['#type'], TRUE),
        ]));
    }

}