class NodeFormSaveChangedTimeTest

class NodeFormSaveChangedTimeTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'node',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * A user with permissions to create and edit articles.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $authorUser;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Create a node type.
        $this->drupalCreateContentType([
            'type' => 'article',
            'name' => 'Article',
        ]);
        $this->authorUser = $this->drupalCreateUser([
            'access content',
            'create article content',
            'edit any article content',
        ], 'author');
        $this->drupalLogin($this->authorUser);
        // Create one node of the above node type .
        $this->drupalCreateNode([
            'type' => 'article',
        ]);
    }
    
    /**
     * Tests the changed time after API and FORM save without changes.
     */
    public function testChangedTimeAfterSaveWithoutChanges() {
        $storage = $this->container
            ->get('entity_type.manager')
            ->getStorage('node');
        $storage->resetCache([
            1,
        ]);
        $node = $storage->load(1);
        $changed_timestamp = $node->getChangedTime();
        $node->save();
        $storage->resetCache([
            1,
        ]);
        $node = $storage->load(1);
        $this->assertEquals($changed_timestamp, $node->getChangedTime(), "The entity's changed time wasn't updated after API save without changes.");
        // Ensure different save timestamps.
        sleep(1);
        // Save the node on the regular node edit form.
        $this->drupalGet('node/1/edit');
        $this->submitForm([], 'Save');
        $storage->resetCache([
            1,
        ]);
        $node = $storage->load(1);
        $this->assertNotEquals($node->getChangedTime(), $changed_timestamp, "The entity's changed time was updated after form save without changes.");
    }

}