New traits for modifying language configuration during testing

Two new traits have been added for changing the language configuration in tests. These should be used whenever the language configuration form itself is not under test.

• LanguageTestTrait, providing methods general to language module.
• ContentTranslationTestTrait, extending the previous trait to make content_translation module related configuration changes.

Sample usage of LanguageTestTrait

use Drupal\Tests\language\Traits\LanguageTestTrait;

class ExampleTest extends BrowserTestBase {
  use LanguageTestTrait;

  protected static $modules = [
    ...
    'node',
    'language',
    ...
  ];

  public function testExample() {
    ...
    self::createLanguageFromLangcode('es');
    self::enableBundleTranslation('node', 'article');
    self::setFieldTranslatable('node', 'article', 'body', TRUE);
    ...
    self::disableBundleTranslation('node', 'article');
    ...
  }
}

Sample usage of ContentTranslationTestTrait

Notice that LanguageTestTrait methods are available on this trait too.

use Drupal\Tests\content_translation\Traits\ContentTranslationTestTrait;

class ExampleTest extends BrowserTestBase {
  use ContentTranslationTestTrait;

  protected static $modules = [
    ...
    'node',
    'content_translation',
    ...
  ];

  public function testExample() {
    ...
    self::createLanguageFromLangcode('es');
    self::enableContentTranslation('node', 'article');
    self::setFieldTranslatable('node', 'article', 'body', TRUE);
    ...
    self::disableBundleTranslation('node', 'article');
    ...
  }
}