doTestNodeWithFileWithoutTitle example

$node = Node::load($nid);
      $this->assertNotNull($node, 'The node was loaded successfully.');
      $this->assertFileExists(File::load($node->field_image->target_id)->getFileUri());
    }
  }

  /** * Tests file submission for an anonymous visitor with a missing node title. */
  public function testAnonymousNodeWithFileWithoutTitle() {
    $this->drupalLogout();
    $this->doTestNodeWithFileWithoutTitle();
  }

  /** * Tests file submission for an authenticated user with a missing node title. */
  public function testAuthenticatedNodeWithFileWithoutTitle() {
    $admin_user = $this->drupalCreateUser([
      'bypass node access',
      'access content overview',
      'administer nodes',
    ]);