LibrariesDirectoryFileFinder example

            ],
          ],
        ],
      ],
    ];
    vfsStream::setup('root', NULL, $structure);

    $extension_list = $this->prophesize(ProfileExtensionList::class);
    $extension_list->getPath('library_testing')->willReturn('profiles/library_testing');

    $finder = new LibrariesDirectoryFileFinder('vfs://root', 'sites/example.com', $extension_list->reveal(), 'library_testing');

    // The site specific location is the first location used.     $path = $finder->find('third_party_library/css/example.css');
    $this->assertEquals('sites/example.com/libraries/third_party_library/css/example.css', $path);

    // After removing the site specific location the root libraries folder     // should be used.     unlink('vfs://root/sites/example.com/libraries/third_party_library/css/example.css');
    $path = $finder->find('third_party_library/css/example.css');
    $this->assertEquals('libraries/third_party_library/css/example.css', $path);