RegistryLegacyTest.php

<?php

namespace Drupal\KernelTests\Core\Theme;

use Drupal\Core\Theme\Registry;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests legacy behavior of the ThemeRegistry class.
 *
 * @group Theme
 * @group legacy
 *
 * @todo Remove in https://www.drupal.org/project/drupal/issues/3097889
 */
class RegistryLegacyTest extends KernelTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'theme_test',
        'system',
    ];
    protected $profile = 'testing';
    
    /**
     * Tests the theme registry with theme functions and multiple subthemes.
     *
     * @expectedDeprecation Theme functions are deprecated in drupal:8.0.0 and are removed from drupal:10.0.0. Use Twig templates instead of theme_theme_test(). See https://www.drupal.org/node/1831138
     */
    public function testMultipleSubThemes() {
        $theme_handler = \Drupal::service('theme_handler');
        \Drupal::service('module_installer')->install([
            'theme_legacy_test',
        ]);
        \Drupal::service('theme_installer')->install([
            'test_basetheme',
        ]);
        $registry_base_theme = new Registry($this->root, \Drupal::cache(), \Drupal::lock(), \Drupal::moduleHandler(), $theme_handler, \Drupal::service('theme.initialization'), 'test_basetheme');
        $registry_base_theme->setThemeManager(\Drupal::theme());
        $preprocess_functions = $registry_base_theme->get()['theme_test_function_suggestions']['preprocess functions'];
        $this->assertSame([
            'template_preprocess_theme_test_function_suggestions',
            'test_basetheme_preprocess_theme_test_function_suggestions',
        ], $preprocess_functions, "Theme functions don't have template_preprocess but do have template_preprocess_HOOK");
    }
    
    /**
     * Tests the theme registry with theme functions with suggestions.
     *
     * @expectedDeprecation Theme functions are deprecated in drupal:8.0.0 and are removed from drupal:10.0.0. Use Twig templates instead of test_legacy_theme_theme_test_preprocess_suggestions__kitten__meerkat(). See https://www.drupal.org/node/1831138
     */
    public function testSuggestionPreprocessFunctions() {
        $theme_handler = \Drupal::service('theme_handler');
        \Drupal::service('theme_installer')->install([
            'test_legacy_theme',
        ]);
        $registry_deprecated_theme = new Registry($this->root, \Drupal::cache(), \Drupal::lock(), \Drupal::moduleHandler(), $theme_handler, \Drupal::service('theme.initialization'), 'test_legacy_theme');
        $registry_deprecated_theme->setThemeManager(\Drupal::theme());
        $expected_preprocess_functions = [
            'template_preprocess',
            'theme_test_preprocess_theme_test_preprocess_suggestions',
            'test_theme_preprocess_theme_test_preprocess_suggestions',
            'test_theme_preprocess_theme_test_preprocess_suggestions__kitten',
        ];
        $preprocess_functions = $registry_deprecated_theme->get()['theme_test_preprocess_suggestions__kitten__meerkat']['preprocess functions'];
        $this->assertSame($expected_preprocess_functions, $preprocess_functions, 'Suggestion implemented as a function correctly inherits preprocess functions.');
    }

}