class LanguageFallbackTest

class LanguageFallbackTest extends LanguageTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $i = 0;
        foreach ([
            'af',
            'am',
            'ar',
        ] as $langcode) {
            $language = ConfigurableLanguage::createFromLangcode($langcode);
            $language->set('weight', $i--);
            $language->save();
        }
    }
    
    /**
     * Tests language fallback candidates.
     */
    public function testCandidates() {
        $language_list = $this->languageManager
            ->getLanguages();
        $expected = array_keys($language_list + [
            LanguageInterface::LANGCODE_NOT_SPECIFIED => NULL,
        ]);
        // Check that language fallback candidates by default are all the available
        // languages sorted by weight.
        $candidates = $this->languageManager
            ->getFallbackCandidates();
        $this->assertEquals($expected, array_values($candidates), 'Language fallback candidates are properly returned.');
        // Check that candidates are alterable.
        $this->state
            ->set('language_test.fallback_alter.candidates', TRUE);
        $expected = array_slice($expected, 0, count($expected) - 1);
        $candidates = $this->languageManager
            ->getFallbackCandidates();
        $this->assertEquals($expected, array_values($candidates), 'Language fallback candidates are alterable.');
        // Check that candidates are alterable for specific operations.
        $this->state
            ->set('language_test.fallback_alter.candidates', FALSE);
        $this->state
            ->set('language_test.fallback_operation_alter.candidates', TRUE);
        $expected[] = LanguageInterface::LANGCODE_NOT_SPECIFIED;
        $expected[] = LanguageInterface::LANGCODE_NOT_APPLICABLE;
        $candidates = $this->languageManager
            ->getFallbackCandidates([
            'operation' => 'test',
        ]);
        $this->assertEquals($expected, array_values($candidates), 'Language fallback candidates are alterable for specific operations.');
        // Check that when the site is monolingual no language fallback is applied.
        
        /** @var \Drupal\Core\Config\Entity\ConfigEntityStorageInterface $configurable_language_storage */
        $configurable_language_storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('configurable_language');
        foreach ($language_list as $langcode => $language) {
            if (!$language->isDefault()) {
                $configurable_language_storage->load($langcode)
                    ->delete();
            }
        }
        $candidates = $this->languageManager
            ->getFallbackCandidates();
        $this->assertEquals([
            LanguageInterface::LANGCODE_DEFAULT,
        ], array_values($candidates), 'Language fallback is not applied when the Language module is not enabled.');
    }

}