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diff --git a/web/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php b/web/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
new file mode 100644
index 000000000..e7a7dfc9d
--- /dev/null
+++ b/web/core/modules/content_translation/src/Tests/ContentTranslationUITestBase.php
@@ -0,0 +1,630 @@
+<?php
+
+namespace Drupal\content_translation\Tests;
+
+use Drupal\Core\Cache\Cache;
+use Drupal\Core\Entity\EntityChangedInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Language\Language;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\Core\Url;
+use Drupal\language\Entity\ConfigurableLanguage;
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\system\Tests\Cache\AssertPageCacheContextsAndTagsTrait;
+
+/**
+ * Tests the Content Translation UI.
+ *
+ * @deprecated Scheduled for removal in Drupal 9.0.0.
+ *   Use \Drupal\Tests\content_translation\Functional\ContentTranslationUITestBase instead.
+ */
+abstract class ContentTranslationUITestBase extends ContentTranslationTestBase {
+
+  use AssertPageCacheContextsAndTagsTrait;
+
+  /**
+   * The id of the entity being translated.
+   *
+   * @var mixed
+   */
+  protected $entityId;
+
+  /**
+   * Whether the behavior of the language selector should be tested.
+   *
+   * @var bool
+   */
+  protected $testLanguageSelector = TRUE;
+
+  /**
+   * Flag that tells whether the HTML escaping of all languages works or not
+   * after SafeMarkup change.
+   *
+   * @var bool
+   */
+  protected $testHTMLEscapeForAllLanguages = FALSE;
+
+  /**
+   * Default cache contexts expected on a non-translated entity.
+   *
+   * Cache contexts will not be checked if this list is empty.
+   *
+   * @var string[]
+   */
+  protected $defaultCacheContexts = ['languages:language_interface', 'theme', 'url.query_args:_wrapper_format', 'user.permissions'];
+
+  /**
+   * Tests the basic translation UI.
+   */
+  public function testTranslationUI() {
+    $this->doTestBasicTranslation();
+    $this->doTestTranslationOverview();
+    $this->doTestOutdatedStatus();
+    $this->doTestPublishedStatus();
+    $this->doTestAuthoringInfo();
+    $this->doTestTranslationEdit();
+    $this->doTestTranslationChanged();
+    $this->doTestChangedTimeAfterSaveWithoutChanges();
+    $this->doTestTranslationDeletion();
+  }
+
+  /**
+   * Tests the basic translation workflow.
+   */
+  protected function doTestBasicTranslation() {
+    // Create a new test entity with original values in the default language.
+    $default_langcode = $this->langcodes[0];
+    $values[$default_langcode] = $this->getNewEntityValues($default_langcode);
+    // Create the entity with the editor as owner, so that afterwards a new
+    // translation is created by the translator and the translation author is
+    // tested.
+    $this->drupalLogin($this->editor);
+    $this->entityId = $this->createEntity($values[$default_langcode], $default_langcode);
+    $this->drupalLogin($this->translator);
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $this->assertTrue($entity, 'Entity found in the database.');
+    $this->drupalGet($entity->urlInfo());
+    $this->assertResponse(200, 'Entity URL is valid.');
+
+    // Ensure that the content language cache context is not yet added to the
+    // page.
+    $this->assertCacheContexts($this->defaultCacheContexts);
+
+    $this->drupalGet($entity->urlInfo('drupal:content-translation-overview'));
+    $this->assertNoText('Source language', 'Source language column correctly hidden.');
+
+    $translation = $this->getTranslation($entity, $default_langcode);
+    foreach ($values[$default_langcode] as $property => $value) {
+      $stored_value = $this->getValue($translation, $property, $default_langcode);
+      $value = is_array($value) ? $value[0]['value'] : $value;
+      $message = format_string('@property correctly stored in the default language.', ['@property' => $property]);
+      $this->assertEqual($stored_value, $value, $message);
+    }
+
+    // Add a content translation.
+    $langcode = 'it';
+    $language = ConfigurableLanguage::load($langcode);
+    $values[$langcode] = $this->getNewEntityValues($langcode);
+
+    $entity_type_id = $entity->getEntityTypeId();
+    $add_url = Url::fromRoute("entity.$entity_type_id.content_translation_add", [
+      $entity->getEntityTypeId() => $entity->id(),
+      'source' => $default_langcode,
+      'target' => $langcode
+    ], ['language' => $language]);
+    $this->drupalPostForm($add_url, $this->getEditValues($values, $langcode), $this->getFormSubmitActionForNewTranslation($entity, $langcode));
+
+    // Assert that HTML is escaped in "all languages" in UI after SafeMarkup
+    // change.
+    if ($this->testHTMLEscapeForAllLanguages) {
+      $this->assertNoRaw('&lt;span class=&quot;translation-entity-all-languages&quot;&gt;(all languages)&lt;/span&gt;');
+      $this->assertRaw('<span class="translation-entity-all-languages">(all languages)</span>');
+    }
+
+    // Ensure that the content language cache context is not yet added to the
+    // page.
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $this->drupalGet($entity->urlInfo());
+    $this->assertCacheContexts(Cache::mergeContexts(['languages:language_content'], $this->defaultCacheContexts));
+
+    // Reset the cache of the entity, so that the new translation gets the
+    // updated values.
+    $metadata_source_translation = $this->manager->getTranslationMetadata($entity->getTranslation($default_langcode));
+    $metadata_target_translation = $this->manager->getTranslationMetadata($entity->getTranslation($langcode));
+
+    $author_field_name = $entity->hasField('content_translation_uid') ? 'content_translation_uid' : 'uid';
+    if ($entity->getFieldDefinition($author_field_name)->isTranslatable()) {
+      $this->assertEqual($metadata_target_translation->getAuthor()->id(), $this->translator->id(),
+        SafeMarkup::format('Author of the target translation @langcode correctly stored for translatable owner field.', ['@langcode' => $langcode]));
+
+      $this->assertNotEqual($metadata_target_translation->getAuthor()->id(), $metadata_source_translation->getAuthor()->id(),
+        SafeMarkup::format('Author of the target translation @target different from the author of the source translation @source for translatable owner field.',
+          ['@target' => $langcode, '@source' => $default_langcode]));
+    }
+    else {
+      $this->assertEqual($metadata_target_translation->getAuthor()->id(), $this->editor->id(), 'Author of the entity remained untouched after translation for non translatable owner field.');
+    }
+
+    $created_field_name = $entity->hasField('content_translation_created') ? 'content_translation_created' : 'created';
+    if ($entity->getFieldDefinition($created_field_name)->isTranslatable()) {
+      $this->assertTrue($metadata_target_translation->getCreatedTime() > $metadata_source_translation->getCreatedTime(),
+        SafeMarkup::format('Translation creation timestamp of the target translation @target is newer than the creation timestamp of the source translation @source for translatable created field.',
+          ['@target' => $langcode, '@source' => $default_langcode]));
+    }
+    else {
+      $this->assertEqual($metadata_target_translation->getCreatedTime(), $metadata_source_translation->getCreatedTime(), 'Creation timestamp of the entity remained untouched after translation for non translatable created field.');
+    }
+
+    if ($this->testLanguageSelector) {
+      $this->assertNoFieldByXPath('//select[@id="edit-langcode-0-value"]', NULL, 'Language selector correctly disabled on translations.');
+    }
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $this->drupalGet($entity->urlInfo('drupal:content-translation-overview'));
+    $this->assertNoText('Source language', 'Source language column correctly hidden.');
+
+    // Switch the source language.
+    $langcode = 'fr';
+    $language = ConfigurableLanguage::load($langcode);
+    $source_langcode = 'it';
+    $edit = ['source_langcode[source]' => $source_langcode];
+    $entity_type_id = $entity->getEntityTypeId();
+    $add_url = Url::fromRoute("entity.$entity_type_id.content_translation_add", [
+      $entity->getEntityTypeId() => $entity->id(),
+      'source' => $default_langcode,
+      'target' => $langcode
+    ], ['language' => $language]);
+    // This does not save anything, it merely reloads the form and fills in the
+    // fields with the values from the different source language.
+    $this->drupalPostForm($add_url, $edit, t('Change'));
+    $this->assertFieldByXPath("//input[@name=\"{$this->fieldName}[0][value]\"]", $values[$source_langcode][$this->fieldName][0]['value'], 'Source language correctly switched.');
+
+    // Add another translation and mark the other ones as outdated.
+    $values[$langcode] = $this->getNewEntityValues($langcode);
+    $edit = $this->getEditValues($values, $langcode) + ['content_translation[retranslate]' => TRUE];
+    $entity_type_id = $entity->getEntityTypeId();
+    $add_url = Url::fromRoute("entity.$entity_type_id.content_translation_add", [
+      $entity->getEntityTypeId() => $entity->id(),
+      'source' => $source_langcode,
+      'target' => $langcode
+    ], ['language' => $language]);
+    $this->drupalPostForm($add_url, $edit, $this->getFormSubmitActionForNewTranslation($entity, $langcode));
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $this->drupalGet($entity->urlInfo('drupal:content-translation-overview'));
+    $this->assertText('Source language', 'Source language column correctly shown.');
+
+    // Check that the entered values have been correctly stored.
+    foreach ($values as $langcode => $property_values) {
+      $translation = $this->getTranslation($entity, $langcode);
+      foreach ($property_values as $property => $value) {
+        $stored_value = $this->getValue($translation, $property, $langcode);
+        $value = is_array($value) ? $value[0]['value'] : $value;
+        $message = format_string('%property correctly stored with language %language.', ['%property' => $property, '%language' => $langcode]);
+        $this->assertEqual($stored_value, $value, $message);
+      }
+    }
+  }
+
+  /**
+   * Tests that the translation overview shows the correct values.
+   */
+  protected function doTestTranslationOverview() {
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $translate_url = $entity->urlInfo('drupal:content-translation-overview');
+    $this->drupalGet($translate_url);
+    $translate_url->setAbsolute(FALSE);
+
+    foreach ($this->langcodes as $langcode) {
+      if ($entity->hasTranslation($langcode)) {
+        $language = new Language(['id' => $langcode]);
+        $view_url = $entity->url('canonical', ['language' => $language]);
+        $elements = $this->xpath('//table//a[@href=:href]', [':href' => $view_url]);
+        $this->assertEqual((string) $elements[0], $entity->getTranslation($langcode)->label(), format_string('Label correctly shown for %language translation.', ['%language' => $langcode]));
+        $edit_path = $entity->url('edit-form', ['language' => $language]);
+        $elements = $this->xpath('//table//ul[@class="dropbutton"]/li/a[@href=:href]', [':href' => $edit_path]);
+        $this->assertEqual((string) $elements[0], t('Edit'), format_string('Edit link correct for %language translation.', ['%language' => $langcode]));
+      }
+    }
+  }
+
+  /**
+   * Tests up-to-date status tracking.
+   */
+  protected function doTestOutdatedStatus() {
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $langcode = 'fr';
+    $languages = \Drupal::languageManager()->getLanguages();
+
+    // Mark translations as outdated.
+    $edit = ['content_translation[retranslate]' => TRUE];
+    $edit_path = $entity->urlInfo('edit-form', ['language' => $languages[$langcode]]);
+    $this->drupalPostForm($edit_path, $edit, $this->getFormSubmitAction($entity, $langcode));
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+
+    // Check that every translation has the correct "outdated" status, and that
+    // the Translation fieldset is open if the translation is "outdated".
+    foreach ($this->langcodes as $added_langcode) {
+      $url = $entity->urlInfo('edit-form', ['language' => ConfigurableLanguage::load($added_langcode)]);
+      $this->drupalGet($url);
+      if ($added_langcode == $langcode) {
+        $this->assertFieldByXPath('//input[@name="content_translation[retranslate]"]', FALSE, 'The retranslate flag is not checked by default.');
+        $this->assertFalse($this->xpath('//details[@id="edit-content-translation" and @open="open"]'), 'The translation tab should be collapsed by default.');
+      }
+      else {
+        $this->assertFieldByXPath('//input[@name="content_translation[outdated]"]', TRUE, 'The translate flag is checked by default.');
+        $this->assertTrue($this->xpath('//details[@id="edit-content-translation" and @open="open"]'), 'The translation tab is correctly expanded when the translation is outdated.');
+        $edit = ['content_translation[outdated]' => FALSE];
+        $this->drupalPostForm($url, $edit, $this->getFormSubmitAction($entity, $added_langcode));
+        $this->drupalGet($url);
+        $this->assertFieldByXPath('//input[@name="content_translation[retranslate]"]', FALSE, 'The retranslate flag is now shown.');
+        $storage = $this->container->get('entity_type.manager')
+          ->getStorage($this->entityTypeId);
+        $storage->resetCache([$this->entityId]);
+        $entity = $storage->load($this->entityId);
+        $this->assertFalse($this->manager->getTranslationMetadata($entity->getTranslation($added_langcode))->isOutdated(), 'The "outdated" status has been correctly stored.');
+      }
+    }
+  }
+
+  /**
+   * Tests the translation publishing status.
+   */
+  protected function doTestPublishedStatus() {
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+
+    // Unpublish translations.
+    foreach ($this->langcodes as $index => $langcode) {
+      if ($index > 0) {
+        $url = $entity->urlInfo('edit-form', ['language' => ConfigurableLanguage::load($langcode)]);
+        $edit = ['content_translation[status]' => FALSE];
+        $this->drupalPostForm($url, $edit, $this->getFormSubmitAction($entity, $langcode));
+        $storage = $this->container->get('entity_type.manager')
+          ->getStorage($this->entityTypeId);
+        $storage->resetCache([$this->entityId]);
+        $entity = $storage->load($this->entityId);
+        $this->assertFalse($this->manager->getTranslationMetadata($entity->getTranslation($langcode))->isPublished(), 'The translation has been correctly unpublished.');
+      }
+    }
+
+    // Check that the last published translation cannot be unpublished.
+    $this->drupalGet($entity->urlInfo('edit-form'));
+    $this->assertFieldByXPath('//input[@name="content_translation[status]" and @disabled="disabled"]', TRUE, 'The last translation is published and cannot be unpublished.');
+  }
+
+  /**
+   * Tests the translation authoring information.
+   */
+  protected function doTestAuthoringInfo() {
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $values = [];
+
+    // Post different authoring information for each translation.
+    foreach ($this->langcodes as $index => $langcode) {
+      $user = $this->drupalCreateUser();
+      $values[$langcode] = [
+        'uid' => $user->id(),
+        'created' => REQUEST_TIME - mt_rand(0, 1000),
+      ];
+      $edit = [
+        'content_translation[uid]' => $user->getUsername(),
+        'content_translation[created]' => format_date($values[$langcode]['created'], 'custom', 'Y-m-d H:i:s O'),
+      ];
+      $url = $entity->urlInfo('edit-form', ['language' => ConfigurableLanguage::load($langcode)]);
+      $this->drupalPostForm($url, $edit, $this->getFormSubmitAction($entity, $langcode));
+    }
+
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    foreach ($this->langcodes as $langcode) {
+      $metadata = $this->manager->getTranslationMetadata($entity->getTranslation($langcode));
+      $this->assertEqual($metadata->getAuthor()->id(), $values[$langcode]['uid'], 'Translation author correctly stored.');
+      $this->assertEqual($metadata->getCreatedTime(), $values[$langcode]['created'], 'Translation date correctly stored.');
+    }
+
+    // Try to post non valid values and check that they are rejected.
+    $langcode = 'en';
+    $edit = [
+      // User names have by default length 8.
+      'content_translation[uid]' => $this->randomMachineName(12),
+      'content_translation[created]' => '19/11/1978',
+    ];
+    $this->drupalPostForm($entity->urlInfo('edit-form'), $edit, $this->getFormSubmitAction($entity, $langcode));
+    $this->assertTrue($this->xpath('//div[contains(@class, "error")]//ul'), 'Invalid values generate a list of form errors.');
+    $metadata = $this->manager->getTranslationMetadata($entity->getTranslation($langcode));
+    $this->assertEqual($metadata->getAuthor()->id(), $values[$langcode]['uid'], 'Translation author correctly kept.');
+    $this->assertEqual($metadata->getCreatedTime(), $values[$langcode]['created'], 'Translation date correctly kept.');
+  }
+
+  /**
+   * Tests translation deletion.
+   */
+  protected function doTestTranslationDeletion() {
+    // Confirm and delete a translation.
+    $this->drupalLogin($this->translator);
+    $langcode = 'fr';
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $language = ConfigurableLanguage::load($langcode);
+    $url = $entity->urlInfo('edit-form', ['language' => $language]);
+    $this->drupalPostForm($url, [], t('Delete translation'));
+    $this->drupalPostForm(NULL, [], t('Delete @language translation', ['@language' => $language->getName()]));
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId, TRUE);
+    if ($this->assertTrue(is_object($entity), 'Entity found')) {
+      $translations = $entity->getTranslationLanguages();
+      $this->assertTrue(count($translations) == 2 && empty($translations[$langcode]), 'Translation successfully deleted.');
+    }
+
+    // Check that the translator cannot delete the original translation.
+    $args = [$this->entityTypeId => $entity->id(), 'language' => 'en'];
+    $this->drupalGet(Url::fromRoute("entity.$this->entityTypeId.content_translation_delete", $args));
+    $this->assertResponse(403);
+  }
+
+  /**
+   * Returns an array of entity field values to be tested.
+   */
+  protected function getNewEntityValues($langcode) {
+    return [$this->fieldName => [['value' => $this->randomMachineName(16)]]];
+  }
+
+  /**
+   * Returns an edit array containing the values to be posted.
+   */
+  protected function getEditValues($values, $langcode, $new = FALSE) {
+    $edit = $values[$langcode];
+    $langcode = $new ? LanguageInterface::LANGCODE_NOT_SPECIFIED : $langcode;
+    foreach ($values[$langcode] as $property => $value) {
+      if (is_array($value)) {
+        $edit["{$property}[0][value]"] = $value[0]['value'];
+        unset($edit[$property]);
+      }
+    }
+    return $edit;
+  }
+
+  /**
+   * Returns the form action value when submitting a new translation.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity being tested.
+   * @param string $langcode
+   *   Language code for the form.
+   *
+   * @return string
+   *   Name of the button to hit.
+   */
+  protected function getFormSubmitActionForNewTranslation(EntityInterface $entity, $langcode) {
+    $entity->addTranslation($langcode, $entity->toArray());
+    return $this->getFormSubmitAction($entity, $langcode);
+  }
+
+  /**
+   * Returns the form action value to be used to submit the entity form.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity being tested.
+   * @param string $langcode
+   *   Language code for the form.
+   *
+   * @return string
+   *   Name of the button to hit.
+   */
+  protected function getFormSubmitAction(EntityInterface $entity, $langcode) {
+    return t('Save') . $this->getFormSubmitSuffix($entity, $langcode);
+  }
+
+  /**
+   * Returns appropriate submit button suffix based on translatability.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity being tested.
+   * @param string $langcode
+   *   Language code for the form.
+   *
+   * @return string
+   *   Submit button suffix based on translatability.
+   */
+  protected function getFormSubmitSuffix(EntityInterface $entity, $langcode) {
+    return '';
+  }
+
+  /**
+   * Returns the translation object to use to retrieve the translated values.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity being tested.
+   * @param string $langcode
+   *   The language code identifying the translation to be retrieved.
+   *
+   * @return \Drupal\Core\TypedData\TranslatableInterface
+   *   The translation object to act on.
+   */
+  protected function getTranslation(EntityInterface $entity, $langcode) {
+    return $entity->getTranslation($langcode);
+  }
+
+  /**
+   * Returns the value for the specified property in the given language.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $translation
+   *   The translation object the property value should be retrieved from.
+   * @param string $property
+   *   The property name.
+   * @param string $langcode
+   *   The property value.
+   *
+   * @return
+   *   The property value.
+   */
+  protected function getValue(EntityInterface $translation, $property, $langcode) {
+    $key = $property == 'user_id' ? 'target_id' : 'value';
+    return $translation->get($property)->{$key};
+  }
+
+  /**
+   * Returns the name of the field that implements the changed timestamp.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity being tested.
+   *
+   * @return string
+   *   The field name.
+   */
+  protected function getChangedFieldName($entity) {
+    return $entity->hasField('content_translation_changed') ? 'content_translation_changed' : 'changed';
+  }
+
+  /**
+   * Tests edit content translation.
+   */
+  protected function doTestTranslationEdit() {
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $languages = $this->container->get('language_manager')->getLanguages();
+
+    foreach ($this->langcodes as $langcode) {
+      // We only want to test the title for non-english translations.
+      if ($langcode != 'en') {
+        $options = ['language' => $languages[$langcode]];
+        $url = $entity->urlInfo('edit-form', $options);
+        $this->drupalGet($url);
+
+        $this->assertRaw($entity->getTranslation($langcode)->label());
+      }
+    }
+  }
+
+  /**
+   * Tests the basic translation workflow.
+   */
+  protected function doTestTranslationChanged() {
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    $changed_field_name = $this->getChangedFieldName($entity);
+    $definition = $entity->getFieldDefinition($changed_field_name);
+    $config = $definition->getConfig($entity->bundle());
+
+    foreach ([FALSE, TRUE] as $translatable_changed_field) {
+      if ($definition->isTranslatable()) {
+        // For entities defining a translatable changed field we want to test
+        // the correct behavior of that field even if the translatability is
+        // revoked. In that case the changed timestamp should be synchronized
+        // across all translations.
+        $config->setTranslatable($translatable_changed_field);
+        $config->save();
+      }
+      elseif ($translatable_changed_field) {
+        // For entities defining a non-translatable changed field we cannot
+        // declare the field as translatable on the fly by modifying its config
+        // because the schema doesn't support this.
+        break;
+      }
+
+      foreach ($entity->getTranslationLanguages() as $language) {
+        // Ensure different timestamps.
+        sleep(1);
+
+        $langcode = $language->getId();
+
+        $edit = [
+          $this->fieldName . '[0][value]' => $this->randomString(),
+        ];
+        $edit_path = $entity->urlInfo('edit-form', ['language' => $language]);
+        $this->drupalPostForm($edit_path, $edit, $this->getFormSubmitAction($entity, $langcode));
+
+        $storage = $this->container->get('entity_type.manager')
+          ->getStorage($this->entityTypeId);
+        $storage->resetCache([$this->entityId]);
+        $entity = $storage->load($this->entityId);
+        $this->assertEqual(
+          $entity->getChangedTimeAcrossTranslations(), $entity->getTranslation($langcode)->getChangedTime(),
+          format_string('Changed time for language %language is the latest change over all languages.', ['%language' => $language->getName()])
+        );
+      }
+
+      $timestamps = [];
+      foreach ($entity->getTranslationLanguages() as $language) {
+        $next_timestamp = $entity->getTranslation($language->getId())->getChangedTime();
+        if (!in_array($next_timestamp, $timestamps)) {
+          $timestamps[] = $next_timestamp;
+        }
+      }
+
+      if ($translatable_changed_field) {
+        $this->assertEqual(
+          count($timestamps), count($entity->getTranslationLanguages()),
+          'All timestamps from all languages are different.'
+        );
+      }
+      else {
+        $this->assertEqual(
+          count($timestamps), 1,
+          'All timestamps from all languages are identical.'
+        );
+      }
+    }
+  }
+
+  /**
+   * Test the changed time after API and FORM save without changes.
+   */
+  public function doTestChangedTimeAfterSaveWithoutChanges() {
+    $storage = $this->container->get('entity_type.manager')
+      ->getStorage($this->entityTypeId);
+    $storage->resetCache([$this->entityId]);
+    $entity = $storage->load($this->entityId);
+    // Test only entities, which implement the EntityChangedInterface.
+    if ($entity instanceof EntityChangedInterface) {
+      $changed_timestamp = $entity->getChangedTime();
+
+      $entity->save();
+      $storage = $this->container->get('entity_type.manager')
+        ->getStorage($this->entityTypeId);
+      $storage->resetCache([$this->entityId]);
+      $entity = $storage->load($this->entityId);
+      $this->assertEqual($changed_timestamp, $entity->getChangedTime(), 'The entity\'s changed time wasn\'t updated after API save without changes.');
+
+      // Ensure different save timestamps.
+      sleep(1);
+
+      // Save the entity on the regular edit form.
+      $language = $entity->language();
+      $edit_path = $entity->urlInfo('edit-form', ['language' => $language]);
+      $this->drupalPostForm($edit_path, [], $this->getFormSubmitAction($entity, $language->getId()));
+
+      $storage->resetCache([$this->entityId]);
+      $entity = $storage->load($this->entityId);
+      $this->assertNotEqual($changed_timestamp, $entity->getChangedTime(), 'The entity\'s changed time was updated after form save without changes.');
+    }
+  }
+
+}