--- /dev/null
+<?php
+
+namespace Drupal\Tests\system\Functional\Entity;
+
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\language\Entity\ConfigurableLanguage;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests entity translation form.
+ *
+ * @group Entity
+ */
+class EntityTranslationFormTest extends BrowserTestBase {
+
+ /**
+ * Modules to enable.
+ *
+ * @var array
+ */
+ public static $modules = ['entity_test', 'language', 'node'];
+
+ protected $langcodes;
+
+ protected function setUp() {
+ parent::setUp();
+ // Enable translations for the test entity type.
+ \Drupal::state()->set('entity_test.translation', TRUE);
+
+ // Create test languages.
+ $this->langcodes = [];
+ for ($i = 0; $i < 2; ++$i) {
+ $language = ConfigurableLanguage::create([
+ 'id' => 'l' . $i,
+ 'label' => $this->randomString(),
+ ]);
+ $this->langcodes[$i] = $language->id();
+ $language->save();
+ }
+ }
+
+ /**
+ * Tests entity form language.
+ */
+ public function testEntityFormLanguage() {
+ $this->drupalCreateContentType(['type' => 'page', 'name' => 'Basic page']);
+
+ $web_user = $this->drupalCreateUser(['create page content', 'edit own page content', 'administer content types']);
+ $this->drupalLogin($web_user);
+
+ // Create a node with language LanguageInterface::LANGCODE_NOT_SPECIFIED.
+ $edit = [];
+ $edit['title[0][value]'] = $this->randomMachineName(8);
+ $edit['body[0][value]'] = $this->randomMachineName(16);
+ $this->drupalGet('node/add/page');
+ $form_langcode = \Drupal::state()->get('entity_test.form_langcode');
+ $this->drupalPostForm(NULL, $edit, t('Save'));
+
+ $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
+
+ $this->assertTrue($node->language()->getId() == $form_langcode, 'Form language is the same as the entity language.');
+
+ // Edit the node and test the form language.
+ $this->drupalGet($this->langcodes[0] . '/node/' . $node->id() . '/edit');
+ $form_langcode = \Drupal::state()->get('entity_test.form_langcode');
+ $this->assertTrue($node->language()->getId() == $form_langcode, 'Form language is the same as the entity language.');
+
+ // Explicitly set form langcode.
+ $langcode = $this->langcodes[0];
+ $form_state_additions['langcode'] = $langcode;
+ \Drupal::service('entity.form_builder')->getForm($node, 'default', $form_state_additions);
+ $form_langcode = \Drupal::state()->get('entity_test.form_langcode');
+ $this->assertTrue($langcode == $form_langcode, 'Form language is the same as the language parameter.');
+
+ // Enable language selector.
+ $this->drupalGet('admin/structure/types/manage/page');
+ $edit = ['language_configuration[language_alterable]' => TRUE, 'language_configuration[langcode]' => LanguageInterface::LANGCODE_NOT_SPECIFIED];
+ $this->drupalPostForm('admin/structure/types/manage/page', $edit, t('Save content type'));
+ $this->assertRaw(t('The content type %type has been updated.', ['%type' => 'Basic page']), 'Basic page content type has been updated.');
+
+ // Create a node with language.
+ $edit = [];
+ $langcode = $this->langcodes[0];
+ $edit['title[0][value]'] = $this->randomMachineName(8);
+ $edit['body[0][value]'] = $this->randomMachineName(16);
+ $edit['langcode[0][value]'] = $langcode;
+ $this->drupalPostForm('node/add/page', $edit, t('Save'));
+ $this->assertText(t('Basic page @title has been created.', ['@title' => $edit['title[0][value]']]), 'Basic page created.');
+
+ // Verify that the creation message contains a link to a node.
+ $view_link = $this->xpath('//div[@class="messages"]//a[contains(@href, :href)]', [':href' => 'node/']);
+ $this->assert(isset($view_link), 'The message area contains a link to a node');
+
+ // Check to make sure the node was created.
+ $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
+ $this->assertTrue($node, 'Node found in database.');
+
+ // Make body translatable.
+ $field_storage = FieldStorageConfig::loadByName('node', 'body');
+ $field_storage->setTranslatable(TRUE);
+ $field_storage->save();
+ $field_storage = FieldStorageConfig::loadByName('node', 'body');
+ $this->assertTrue($field_storage->isTranslatable(), 'Field body is translatable.');
+
+ // Create a body translation and check the form language.
+ $langcode2 = $this->langcodes[1];
+ $translation = $node->addTranslation($langcode2);
+ $translation->title->value = $this->randomString();
+ $translation->body->value = $this->randomMachineName(16);
+ $translation->setOwnerId($web_user->id());
+ $node->save();
+ $this->drupalGet($langcode2 . '/node/' . $node->id() . '/edit');
+ $form_langcode = \Drupal::state()->get('entity_test.form_langcode');
+ $this->assertTrue($langcode2 == $form_langcode, "Node edit form language is $langcode2.");
+ }
+
+}