getFileSecret example

    $this->drupalGet('node/1/layout');
    $this->removeInlineBlockFromLayout();
    $this->assertSaveLayout();

    $this->drupalGet('node/1');
    $assert_session->pageTextNotContains($file->label());
    // Try to access file directly after it has been removed. Since a new     // revision was not created for the node the inline block is not in the     // layout of a previous revision of the node.     $this->drupalGet($private_href1);
    $assert_session->pageTextContains('You are not authorized to access this page');
    $assert_session->pageTextNotContains($this->getFileSecret($file));
    $this->assertFileExists($file_real_path);

    $file2 = $this->createPrivateFile('2ndFile.txt');

    $this->drupalGet('node/1/layout');
    $this->addInlineFileBlockToLayout('Number2', $file2);
    $this->assertSaveLayout();

    $this->drupalGet('node/1');
    $private_href2 = $this->getFileHrefAccessibleOnNode($file2);