class ConfigTranslationInstallTest

class ConfigTranslationInstallTest extends InstallerTestBase {
    use ContentTypeCreationTrait;
    
    /**
     * {@inheritdoc}
     */
    protected $langcode = 'eo';
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUpLanguage() : void {
        // Place custom local translations in the translations directory.
        mkdir(DRUPAL_ROOT . '/' . $this->siteDirectory . '/files/translations', 0777, TRUE);
        file_put_contents(DRUPAL_ROOT . '/' . $this->siteDirectory . '/files/translations/drupal-8.0.0.eo.po', $this->getPo('eo'));
        parent::setUpLanguage();
        $this->translations['Save and continue'] = 'Save and continue eo';
    }
    
    /**
     * Returns the string for the test .po file.
     *
     * @param string $langcode
     *   The language code.
     *
     * @return string
     *   Contents for the test .po file.
     */
    protected function getPo($langcode) : string {
        return <<<PO
msgid ""
msgstr ""

msgid "Save and continue"
msgstr "Save and continue {<span class="php-variable">$langcode</span>}"

msgid "Anonymous"
msgstr "Anonymous {<span class="php-variable">$langcode</span>}"

msgid "Language"
msgstr "Language {<span class="php-variable">$langcode</span>}"
PO;
    }
    public function testConfigTranslation() : void {
        \Drupal::service('module_installer')->install([
            'node',
            'field_ui',
        ]);
        $this->createContentType([
            'type' => 'article',
        ]);
        $this->drupalGet('admin/config/regional/language/add');
        $this->submitForm([
            'predefined_langcode' => 'en',
        ], 'Add custom language');
        $this->drupalGet('admin/config/regional/language/add');
        $this->submitForm([
            'predefined_langcode' => 'fr',
        ], 'Add custom language');
        $edit = [
            'modules[config_translation][enable]' => TRUE,
        ];
        $this->drupalGet('admin/modules');
        $this->submitForm($edit, 'Install');
        $this->drupalGet('/admin/structure/types/manage/article/fields');
        $this->assertSession()
            ->statusCodeEquals(200);
    }

}