DefaultMobileMetaTagsTest.php

<?php

namespace Drupal\Tests\system\Functional\System;

use Drupal\Tests\BrowserTestBase;

/**
 * Confirm that the default mobile meta tags appear as expected.
 *
 * @group system
 */
class DefaultMobileMetaTagsTest extends BrowserTestBase {
    
    /**
     * Array of default meta tags to insert into the page.
     *
     * @var array
     */
    protected $defaultMetaTags;
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->defaultMetaTags = [
            'viewport' => '<meta name="viewport" content="width=device-width, initial-scale=1.0" />',
        ];
    }
    
    /**
     * Verifies that the default mobile meta tags are added.
     */
    public function testDefaultMetaTagsExist() {
        $this->drupalGet('');
        foreach ($this->defaultMetaTags as $name => $metatag) {
            $this->assertSession()
                ->responseContains($metatag);
        }
    }
    
    /**
     * Verifies that the default mobile meta tags can be removed.
     */
    public function testRemovingDefaultMetaTags() {
        \Drupal::service('module_installer')->install([
            'system_module_test',
        ]);
        $this->drupalGet('');
        foreach ($this->defaultMetaTags as $name => $metatag) {
            $this->assertSession()
                ->responseNotContains($metatag);
        }
    }

}