FormValuesTest.php

<?php

namespace Drupal\FunctionalJavascriptTests\Ajax;

use Drupal\FunctionalJavascriptTests\WebDriverTestBase;

/**
 * Tests that form values are properly delivered to AJAX callbacks.
 *
 * @group Ajax
 */
class FormValuesTest extends WebDriverTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'node',
        'ajax_test',
        'ajax_forms_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalLogin($this->drupalCreateUser([
            'access content',
        ]));
    }
    
    /**
     * Submits forms with select and checkbox elements via Ajax.
     */
    public function testSimpleAjaxFormValue() {
        $this->drupalGet('ajax_forms_test_get_form');
        $session = $this->getSession();
        $assertSession = $this->assertSession();
        // Verify form values of a select element.
        foreach ([
            'green',
            'blue',
            'red',
        ] as $item) {
            // Updating the field will trigger an AJAX request/response.
            $session->getPage()
                ->selectFieldOption('select', $item);
            // The AJAX command in the response will update the DOM
            $select = $assertSession->waitForElement('css', "div#ajax_selected_color:contains('{$item}')");
            $this->assertNotNull($select, "DataCommand has updated the page with a value of {$item}.");
        }
        // Verify form values of a checkbox element.
        $session->getPage()
            ->checkField('checkbox');
        $div0 = $this->assertSession()
            ->waitForElement('css', "div#ajax_checkbox_value:contains('checked')");
        $this->assertNotNull($div0, 'DataCommand updates the DOM as expected when a checkbox is selected');
        $session->getPage()
            ->uncheckField('checkbox');
        $div1 = $this->assertSession()
            ->waitForElement('css', "div#ajax_checkbox_value:contains('unchecked')");
        $this->assertNotNull($div1, 'DataCommand updates the DOM as expected when a checkbox is de-selected');
        // Verify that AJAX elements with invalid callbacks return error code 500.
        // Ensure the test error log is empty before these tests.
        $this->assertFileDoesNotExist(DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log');
        // We don't need to check for the X-Drupal-Ajax-Token header with these
        // invalid requests.
        foreach ([
            'null',
            'empty',
            'nonexistent',
        ] as $key) {
            $element_name = 'select_' . $key . '_callback';
            // Updating the field will trigger an AJAX request/response.
            $session->getPage()
                ->selectFieldOption($element_name, 'green');
            // The select element is disabled as the AJAX request is issued.
            $this->assertSession()
                ->waitForElement('css', "select[name=\"{$element_name}\"]:disabled");
            // The select element is enabled as the response is received.
            $this->assertSession()
                ->waitForElement('css', "select[name=\"{$element_name}\"]:enabled");
            $this->assertFileExists(DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log');
            $this->assertStringContainsString('"The specified #ajax callback is empty or not callable."', file_get_contents(DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log'));
            // The exceptions are expected. Do not interpret them as a test failure.
            // Not using File API; a potential error must trigger a PHP warning.
            unlink(\Drupal::root() . '/' . $this->siteDirectory . '/error.log');
        }
        // We need to reload the page to kill any unfinished AJAX calls before
        // tearDown() is called.
        $this->drupalGet('ajax_forms_test_get_form');
    }

}