class ContentTranslationUITestBase

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 to determine if "all languages" rendering is tested.
     *
     * @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);
        $this->assertNotEmpty($entity, 'Entity found in the database.');
        $this->drupalGet($entity->toUrl());
        $this->assertSession()
            ->statusCodeEquals(200);
        // Ensure that the content language cache context is not yet added to the
        // page.
        $this->assertCacheContexts($this->defaultCacheContexts);
        $this->drupalGet($entity->toUrl('drupal:content-translation-overview'));
        $this->assertSession()
            ->pageTextNotContains('Source language');
        $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 = new FormattableMarkup('@property correctly stored in the default language.', [
                '@property' => $property,
            ]);
            $this->assertEquals($value, $stored_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,
        ]);
        $this->drupalGet($add_url);
        $this->submitForm($this->getEditValues($values, $langcode), $this->getFormSubmitActionForNewTranslation($entity, $langcode));
        // Assert that HTML is not escaped unexpectedly.
        if ($this->testHTMLEscapeForAllLanguages) {
            $this->assertSession()
                ->responseNotContains('<span class="translation-entity-all-languages">(all languages)</span>');
            $this->assertSession()
                ->responseContains('<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->toUrl());
        $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()) {
            $this->assertEquals($this->translator
                ->id(), $metadata_target_translation->getAuthor()
                ->id(), new FormattableMarkup('Author of the target translation @langcode correctly stored for translatable owner field.', [
                '@langcode' => $langcode,
            ]));
            $this->assertNotEquals($metadata_target_translation->getAuthor()
                ->id(), $metadata_source_translation->getAuthor()
                ->id(), new FormattableMarkup('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 {
            $this->assertEquals($this->editor
                ->id(), $metadata_target_translation->getAuthor()
                ->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()) {
            // Verify that the translation creation timestamp of the target
            // translation language is newer than the creation timestamp of the source
            // translation default language for the translatable created field.
            $this->assertGreaterThan($metadata_source_translation->getCreatedTime(), $metadata_target_translation->getCreatedTime());
        }
        else {
            $this->assertEquals($metadata_source_translation->getCreatedTime(), $metadata_target_translation->getCreatedTime(), 'Creation timestamp of the entity remained untouched after translation for non translatable created field.');
        }
        if ($this->testLanguageSelector) {
            // Verify that language selector is correctly disabled on translations.
            $this->assertSession()
                ->fieldNotExists('edit-langcode-0-value');
        }
        $storage->resetCache([
            $this->entityId,
        ]);
        $entity = $storage->load($this->entityId);
        $this->drupalGet($entity->toUrl('drupal:content-translation-overview'));
        $this->assertSession()
            ->pageTextNotContains('Source language');
        // 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.
        $this->drupalGet($add_url);
        $this->submitForm($edit, 'Change');
        $this->assertSession()
            ->fieldValueEquals("{$this->fieldName}[0][value]", $values[$source_langcode][$this->fieldName][0]['value']);
        // 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,
        ]);
        $this->drupalGet($add_url);
        $this->submitForm($edit, $this->getFormSubmitActionForNewTranslation($entity, $langcode));
        $storage->resetCache([
            $this->entityId,
        ]);
        $entity = $storage->load($this->entityId);
        $this->drupalGet($entity->toUrl('drupal:content-translation-overview'));
        $this->assertSession()
            ->pageTextContains('Source language');
        // Check that the entered values have been correctly stored.
        foreach ($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 = new FormattableMarkup('%property correctly stored with language %language.', [
                    '%property' => $property,
                    '%language' => $langcode,
                ]);
                $this->assertEquals($value, $stored_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->toUrl('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,
                ]);
                // Test that label is correctly shown for translation.
                $view_url = $entity->toUrl('canonical', [
                    'language' => $language,
                ])
                    ->toString();
                $this->assertSession()
                    ->elementTextEquals('xpath', "//table//a[@href='{$view_url}']", $entity->getTranslation($langcode)
                    ->label() ?? $entity->getTranslation($langcode)
                    ->id());
                // Test that edit link is correct for translation.
                $edit_path = $entity->toUrl('edit-form', [
                    'language' => $language,
                ])
                    ->toString();
                $this->assertSession()
                    ->elementTextEquals('xpath', "//table//ul[@class='dropbutton']/li/a[@href='{$edit_path}']", 'Edit');
            }
        }
    }
    
    /**
     * 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->toUrl('edit-form', [
            'language' => $languages[$langcode],
        ]);
        $this->drupalGet($edit_path);
        $this->submitForm($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 = $entity->toUrl('edit-form', [
                'language' => ConfigurableLanguage::load($added_langcode),
            ]);
            $this->drupalGet($url);
            if ($added_langcode == $langcode) {
                // Verify that the retranslate flag is not checked by default.
                $this->assertSession()
                    ->fieldValueEquals('content_translation[retranslate]', FALSE);
                $this->assertSession()
                    ->elementNotExists('xpath', '//details[@id="edit-content-translation" and @open="open"]');
            }
            else {
                // Verify that the translate flag is checked by default.
                $this->assertSession()
                    ->fieldValueEquals('content_translation[outdated]', TRUE);
                $this->assertSession()
                    ->elementExists('xpath', '//details[@id="edit-content-translation" and @open="open"]');
                $edit = [
                    'content_translation[outdated]' => FALSE,
                ];
                $this->drupalGet($url);
                $this->submitForm($edit, $this->getFormSubmitAction($entity, $added_langcode));
                $this->drupalGet($url);
                // Verify that retranslate flag is now shown.
                $this->assertSession()
                    ->fieldValueEquals('content_translation[retranslate]', FALSE);
                $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 = $entity->toUrl('edit-form', [
                    'language' => ConfigurableLanguage::load($langcode),
                ]);
                $edit = [
                    'content_translation[status]' => FALSE,
                ];
                $this->drupalGet($url);
                $this->submitForm($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->toUrl('edit-form'));
        $this->assertSession()
            ->fieldDisabled('content_translation[status]');
        $this->assertSession()
            ->fieldValueEquals('content_translation[status]', TRUE);
    }
    
    /**
     * 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->getAccountName(),
                'content_translation[created]' => $this->container
                    ->get('date.formatter')
                    ->format($values[$langcode]['created'], 'custom', 'Y-m-d H:i:s O'),
            ];
            $url = $entity->toUrl('edit-form', [
                'language' => ConfigurableLanguage::load($langcode),
            ]);
            $this->drupalGet($url);
            $this->submitForm($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));
            $this->assertEquals($values[$langcode]['uid'], $metadata->getAuthor()
                ->id(), 'Translation author correctly stored.');
            $this->assertEquals($values[$langcode]['created'], $metadata->getCreatedTime(), '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',
        ];
        $this->drupalGet($entity->toUrl('edit-form'));
        $this->submitForm($edit, $this->getFormSubmitAction($entity, $langcode));
        $this->assertSession()
            ->statusMessageExists('error');
        $metadata = $this->manager
            ->getTranslationMetadata($entity->getTranslation($langcode));
        $this->assertEquals($values[$langcode]['uid'], $metadata->getAuthor()
            ->id(), 'Translation author correctly kept.');
        $this->assertEquals($values[$langcode]['created'], $metadata->getCreatedTime(), '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->toUrl('edit-form', [
            'language' => $language,
        ]);
        $this->drupalGet($url);
        $this->submitForm([], 'Delete translation');
        $this->submitForm([], 'Delete ' . $language->getName() . ' translation');
        $storage->resetCache([
            $this->entityId,
        ]);
        $entity = $storage->load($this->entityId, TRUE);
        $this->assertIsObject($entity);
        $translations = $entity->getTranslationLanguages();
        $this->assertCount(2, $translations);
        $this->assertArrayNotHasKey($langcode, $translations);
        // 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->assertSession()
            ->statusCodeEquals(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 '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 mixed
     *   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->toUrl('edit-form', $options);
                $this->drupalGet($url);
                $this->assertSession()
                    ->responseContains($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->toUrl('edit-form', [
                    'language' => $language,
                ]);
                $this->drupalGet($edit_path);
                $this->submitForm($edit, $this->getFormSubmitAction($entity, $langcode));
                $storage = $this->container
                    ->get('entity_type.manager')
                    ->getStorage($this->entityTypeId);
                $storage->resetCache([
                    $this->entityId,
                ]);
                $entity = $storage->load($this->entityId);
                $this->assertEquals($entity->getChangedTimeAcrossTranslations(), $entity->getTranslation($langcode)
                    ->getChangedTime(), new FormattableMarkup('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) {
                $this->assertSameSize($entity->getTranslationLanguages(), $timestamps, 'All timestamps from all languages are different.');
            }
            else {
                $this->assertCount(1, $timestamps, 'All timestamps from all languages are identical.');
            }
        }
    }
    
    /**
     * Tests 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);
            $this->assertEquals($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->toUrl('edit-form', [
                'language' => $language,
            ]);
            $this->drupalGet($edit_path);
            $this->submitForm([], $this->getFormSubmitAction($entity, $language->getId()));
            $storage->resetCache([
                $this->entityId,
            ]);
            $entity = $storage->load($this->entityId);
            $this->assertNotEquals($changed_timestamp, $entity->getChangedTime(), 'The entity\'s changed time was updated after form save without changes.');
        }
    }

}