ThemeLegacyTest.php

<?php

namespace Drupal\Tests\system\Functional\Theme;

use Drupal\Tests\BrowserTestBase;

/**
 * Tests legacy theme functions.
 *
 * @group Theme
 * @group legacy
 *
 * @todo Remove in https://www.drupal.org/project/drupal/issues/3097889
 */
class ThemeLegacyTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'theme_test',
        'theme_legacy_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    protected function setUp() {
        parent::setUp();
        \Drupal::service('theme_installer')->install([
            'test_legacy_theme',
        ]);
    }
    
    /**
     * Ensures a theme template can override a theme function.
     */
    public function testFunctionOverride() {
        $this->drupalGet('theme-test/function-template-overridden');
        $this->assertText('Success: Template overrides theme function.', 'Theme function overridden by test_theme template.');
    }
    
    /**
     * Tests that theme suggestion alter hooks work for theme functions.
     */
    public function testThemeFunctionSuggestionsAlter() {
        $this->drupalGet('theme-test/function-suggestion-alter');
        $this->assertText('Original theme function.');
        // Install test_theme and test that themes can alter theme suggestions.
        $this->config('system.theme')
            ->set('default', 'test_legacy_theme')
            ->save();
        $this->drupalGet('theme-test/function-suggestion-alter');
        $this->assertText('Theme function overridden based on new theme suggestion provided by the test_legacy_theme theme.');
        // Enable the theme_suggestions_test module to test modules implementing
        // suggestions alter hooks.
        \Drupal::service('module_installer')->install([
            'theme_legacy_suggestions_test',
        ]);
        $this->resetAll();
        $this->drupalGet('theme-test/function-suggestion-alter');
        $this->assertText('Theme function overridden based on new theme suggestion provided by a module.');
    }
    
    /**
     * Tests that theme suggestion alter hooks work with theme hook includes.
     */
    public function testSuggestionsAlterInclude() {
        // Check the original theme output.
        $this->drupalGet('theme-test/suggestion-alter-include');
        $this->assertText('Original function before altering theme suggestions.');
        // Enable theme_suggestions_test module and make two requests to make sure
        // the include file is always loaded. The file will always be included for
        // the first request because the theme registry is being rebuilt.
        \Drupal::service('module_installer')->install([
            'theme_legacy_suggestions_test',
        ]);
        $this->resetAll();
        $this->drupalGet('theme-test/suggestion-alter-include');
        $this->assertText('Function suggested via suggestion alter hook found in include file.', 'Include file loaded for initial request.');
        $this->drupalGet('theme-test/suggestion-alter-include');
        $this->assertText('Function suggested via suggestion alter hook found in include file.', 'Include file loaded for second request.');
    }

}