--- /dev/null
+<?php
+
+namespace Drupal\Tests\node\Functional;
+
+use Drupal\node\NodeInterface;
+use Drupal\user\Entity\User;
+
+/**
+ * Create a node and test node edit functionality.
+ *
+ * @group node
+ */
+class NodeEditFormTest extends NodeTestBase {
+
+ /**
+ * A normal logged in user.
+ *
+ * @var \Drupal\user\UserInterface
+ */
+ protected $webUser;
+
+ /**
+ * A user with permission to bypass content access checks.
+ *
+ * @var \Drupal\user\UserInterface
+ */
+ protected $adminUser;
+
+ /**
+ * The node storage.
+ *
+ * @var \Drupal\node\NodeStorageInterface
+ */
+ protected $nodeStorage;
+
+ /**
+ * Modules to enable.
+ *
+ * @var string[]
+ */
+ public static $modules = ['block', 'node', 'datetime'];
+
+ protected function setUp() {
+ parent::setUp();
+
+ $this->webUser = $this->drupalCreateUser(['edit own page content', 'create page content']);
+ $this->adminUser = $this->drupalCreateUser(['bypass node access', 'administer nodes']);
+ $this->drupalPlaceBlock('local_tasks_block');
+
+ $this->nodeStorage = $this->container->get('entity.manager')->getStorage('node');
+ }
+
+ /**
+ * Checks node edit functionality.
+ */
+ public function testNodeEdit() {
+ $this->drupalLogin($this->webUser);
+
+ $title_key = 'title[0][value]';
+ $body_key = 'body[0][value]';
+ // Create node to edit.
+ $edit = [];
+ $edit[$title_key] = $this->randomMachineName(8);
+ $edit[$body_key] = $this->randomMachineName(16);
+ $this->drupalPostForm('node/add/page', $edit, t('Save'));
+
+ // Check that the node exists in the database.
+ $node = $this->drupalGetNodeByTitle($edit[$title_key]);
+ $this->assertTrue($node, 'Node found in database.');
+
+ // Check that "edit" link points to correct page.
+ $this->clickLink(t('Edit'));
+ $this->assertUrl($node->url('edit-form', ['absolute' => TRUE]));
+
+ // Check that the title and body fields are displayed with the correct values.
+ // @todo Ideally assertLink would support HTML, but it doesn't.
+ $this->assertRaw('Edit<span class="visually-hidden">(active tab)</span>', 'Edit tab found and marked active.');
+ $this->assertFieldByName($title_key, $edit[$title_key], 'Title field displayed.');
+ $this->assertFieldByName($body_key, $edit[$body_key], 'Body field displayed.');
+
+ // Edit the content of the node.
+ $edit = [];
+ $edit[$title_key] = $this->randomMachineName(8);
+ $edit[$body_key] = $this->randomMachineName(16);
+ // Stay on the current page, without reloading.
+ $this->drupalPostForm(NULL, $edit, t('Save'));
+
+ // Check that the title and body fields are displayed with the updated values.
+ $this->assertText($edit[$title_key], 'Title displayed.');
+ $this->assertText($edit[$body_key], 'Body displayed.');
+
+ // Log in as a second administrator user.
+ $second_web_user = $this->drupalCreateUser(['administer nodes', 'edit any page content']);
+ $this->drupalLogin($second_web_user);
+ // Edit the same node, creating a new revision.
+ $this->drupalGet("node/" . $node->id() . "/edit");
+ $edit = [];
+ $edit['title[0][value]'] = $this->randomMachineName(8);
+ $edit[$body_key] = $this->randomMachineName(16);
+ $edit['revision'] = TRUE;
+ $this->drupalPostForm(NULL, $edit, t('Save and keep published'));
+
+ // Ensure that the node revision has been created.
+ $revised_node = $this->drupalGetNodeByTitle($edit['title[0][value]'], TRUE);
+ $this->assertNotIdentical($node->getRevisionId(), $revised_node->getRevisionId(), 'A new revision has been created.');
+ // Ensure that the node author is preserved when it was not changed in the
+ // edit form.
+ $this->assertIdentical($node->getOwnerId(), $revised_node->getOwnerId(), 'The node author has been preserved.');
+ // Ensure that the revision authors are different since the revisions were
+ // made by different users.
+ $first_node_version = node_revision_load($node->getRevisionId());
+ $second_node_version = node_revision_load($revised_node->getRevisionId());
+ $this->assertNotIdentical($first_node_version->getRevisionUser()->id(), $second_node_version->getRevisionUser()->id(), 'Each revision has a distinct user.');
+
+ // Check if the node revision checkbox is rendered on node edit form.
+ $this->drupalGet('node/' . $node->id() . '/edit');
+ $this->assertFieldById('edit-revision', NULL, 'The revision field is present.');
+
+ // Check that details form element opens when there are errors on child
+ // elements.
+ $this->drupalGet('node/' . $node->id() . '/edit');
+ $edit = [];
+ // This invalid date will trigger an error.
+ $edit['created[0][value][date]'] = $this->randomMachineName(8);
+ // Get the current amount of open details elements.
+ $open_details_elements = count($this->cssSelect('details[open="open"]'));
+ $this->drupalPostForm(NULL, $edit, t('Save and keep published'));
+ // The node author details must be open.
+ $this->assertRaw('<details class="node-form-author js-form-wrapper form-wrapper" data-drupal-selector="edit-author" id="edit-author" open="open">');
+ // Only one extra details element should now be open.
+ $open_details_elements++;
+ $this->assertEqual(count($this->cssSelect('details[open="open"]')), $open_details_elements, 'Exactly one extra open <details> element found.');
+ }
+
+ /**
+ * Tests changing a node's "authored by" field.
+ */
+ public function testNodeEditAuthoredBy() {
+ $this->drupalLogin($this->adminUser);
+
+ // Create node to edit.
+ $body_key = 'body[0][value]';
+ $edit = [];
+ $edit['title[0][value]'] = $this->randomMachineName(8);
+ $edit[$body_key] = $this->randomMachineName(16);
+ $this->drupalPostForm('node/add/page', $edit, t('Save and publish'));
+
+ // Check that the node was authored by the currently logged in user.
+ $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
+ $this->assertIdentical($node->getOwnerId(), $this->adminUser->id(), 'Node authored by admin user.');
+
+ $this->checkVariousAuthoredByValues($node, 'uid[0][target_id]');
+
+ // Check that normal users cannot change the authored by information.
+ $this->drupalLogin($this->webUser);
+ $this->drupalGet('node/' . $node->id() . '/edit');
+ $this->assertNoFieldByName('uid[0][target_id]');
+
+ // Now test with the Autcomplete (Tags) field widget.
+ /** @var \Drupal\Core\Entity\Display\EntityFormDisplayInterface $form_display */
+ $form_display = \Drupal::entityManager()->getStorage('entity_form_display')->load('node.page.default');
+ $widget = $form_display->getComponent('uid');
+ $widget['type'] = 'entity_reference_autocomplete_tags';
+ $widget['settings'] = [
+ 'match_operator' => 'CONTAINS',
+ 'size' => 60,
+ 'placeholder' => '',
+ ];
+ $form_display->setComponent('uid', $widget);
+ $form_display->save();
+
+ $this->drupalLogin($this->adminUser);
+
+ // Save the node without making any changes.
+ $this->drupalPostForm('node/' . $node->id() . '/edit', [], t('Save and keep published'));
+ $this->nodeStorage->resetCache([$node->id()]);
+ $node = $this->nodeStorage->load($node->id());
+ $this->assertIdentical($this->webUser->id(), $node->getOwner()->id());
+
+ $this->checkVariousAuthoredByValues($node, 'uid[target_id]');
+
+ // Hide the 'authored by' field from the form.
+ $form_display->removeComponent('uid')->save();
+
+ // Check that saving the node without making any changes keeps the proper
+ // author ID.
+ $this->drupalPostForm('node/' . $node->id() . '/edit', [], t('Save and keep published'));
+ $this->nodeStorage->resetCache([$node->id()]);
+ $node = $this->nodeStorage->load($node->id());
+ $this->assertIdentical($this->webUser->id(), $node->getOwner()->id());
+ }
+
+ /**
+ * Checks that the "authored by" works correctly with various values.
+ *
+ * @param \Drupal\node\NodeInterface $node
+ * A node object.
+ * @param string $form_element_name
+ * The name of the form element to populate.
+ */
+ protected function checkVariousAuthoredByValues(NodeInterface $node, $form_element_name) {
+ // Try to change the 'authored by' field to an invalid user name.
+ $edit = [
+ $form_element_name => 'invalid-name',
+ ];
+ $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
+ $this->assertRaw(t('There are no entities matching "%name".', ['%name' => 'invalid-name']));
+
+ // Change the authored by field to an empty string, which should assign
+ // authorship to the anonymous user (uid 0).
+ $edit[$form_element_name] = '';
+ $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
+ $this->nodeStorage->resetCache([$node->id()]);
+ $node = $this->nodeStorage->load($node->id());
+ $uid = $node->getOwnerId();
+ // Most SQL database drivers stringify fetches but entities are not
+ // necessarily stored in a SQL database. At the same time, NULL/FALSE/""
+ // won't do.
+ $this->assertTrue($uid === 0 || $uid === '0', 'Node authored by anonymous user.');
+
+ // Go back to the edit form and check that the correct value is displayed
+ // in the author widget.
+ $this->drupalGet('node/' . $node->id() . '/edit');
+ $anonymous_user = User::getAnonymousUser();
+ $expected = $anonymous_user->label() . ' (' . $anonymous_user->id() . ')';
+ $this->assertFieldByName($form_element_name, $expected, 'Authored by field displays the correct value for the anonymous user.');
+
+ // Change the authored by field to another user's name (that is not
+ // logged in).
+ $edit[$form_element_name] = $this->webUser->getUsername();
+ $this->drupalPostForm(NULL, $edit, t('Save and keep published'));
+ $this->nodeStorage->resetCache([$node->id()]);
+ $node = $this->nodeStorage->load($node->id());
+ $this->assertIdentical($node->getOwnerId(), $this->webUser->id(), 'Node authored by normal user.');
+ }
+
+}