DependentDropdownTest.php

<?php

namespace Drupal\Tests\ajax_example\Functional;

use Drupal\Core\Url;
use Drupal\Tests\BrowserTestBase;

/**
 * Functional test of non-AJAX dependent dropdown example.
 *
 * @group ajax_example
 * @group examples
 *
 * @ingroup ajax_example
 *
 * @see \Drupal\Tests\ajax_example\FunctionalJavascript\DependentDropdownTest
 */
class DependentDropdownTest extends BrowserTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'ajax_example',
  ];
  
  /**
   * Test the dependent dropdown form without AJAX.
   */
  public function testDependentDropdown() {
    // Get the Mink stuff.
    $session = $this->getSession();
    $assert = $this->assertSession();
    $page = $session->getPage();
    // Get a URL object for the form, specifying no JS.
    $dropdown_url = Url::fromRoute('ajax_example.dependent_dropdown', [
      'nojs' => 'nojs',
    ]);
    // Get the form.
    $this->drupalGet($dropdown_url);
    // Check for the initial state.
    $assert->fieldDisabled('instrument_dropdown');
    $assert->fieldValueEquals('instrument_dropdown', 'none');
    $submit_button = $page->findButton('edit-submit');
    $this->assertTrue($submit_button->hasAttribute('disabled'));
    // Run through the matrix of form submissions.
    $families = [
      'String' => [
        'Violin',
        'Viola',
        'Cello',
        'Double Bass',
      ],
      'Woodwind' => [
        'Flute',
        'Clarinet',
        'Oboe',
        'Bassoon',
      ],
      'Brass' => [
        'Trumpet',
        'Trombone',
        'French Horn',
        'Euphonium',
      ],
      'Percussion' => [
        'Bass Drum',
        'Timpani',
        'Snare Drum',
        'Tambourine',
      ],
    ];
    foreach ($families as $family => $instruments) {
      // Post the form for the instrument family.
      $this->drupalGet($dropdown_url);
      $this->submitForm([
        'instrument_family_dropdown' => $family,
      ], 'Choose');
      // Get the instrument dropdown elements.
      $instrument_options = $page->findAll('css', '#edit-instrument-dropdown option');
      $this->assertCount(count($instruments), $instrument_options);
      // Make sure all the instruments are in the select dropdown.
      foreach ($instrument_options as $instrument) {
        $this->assertContains($instrument->getAttribute('value'), $instruments);
      }
      // Post each instrument. We have to 'choose' again in order to unlock the
      // instrument dropdown.
      foreach ($instruments as $instrument) {
        $this->drupalGet($dropdown_url);
        $this->submitForm([
          'instrument_family_dropdown' => $family,
        ], 'Choose');
        $this->submitForm([
          'instrument_dropdown' => $instrument,
        ], 'Submit');
        $assert->pageTextContains("Your values have been submitted. Instrument family: {$family}, Instrument: {$instrument}");
      }
    }
  }

}