Наследование: extends FileSystemStorage, implements Neos\Flow\ResourceManagement\Storage\WritableStorageInterface
 /**
  * @test
  */
 public function importTemporaryFileSkipsFilesThatAlreadyExist()
 {
     $mockTempFile = vfsStream::newFile('SomeTemporaryFile', 0333)->withContent('fixture')->at($this->mockDirectory);
     $finalTargetPathAndFilename = $this->writableFileSystemStorage->_call('getStoragePathAndFilenameByHash', sha1('fixture'));
     Files::createDirectoryRecursively(dirname($finalTargetPathAndFilename));
     file_put_contents($finalTargetPathAndFilename, 'existing file');
     $this->writableFileSystemStorage->_call('importTemporaryFile', $mockTempFile->url(), 'default');
     $this->assertSame('existing file', file_get_contents($finalTargetPathAndFilename));
 }