/**
  *
  */
 public function testDelete()
 {
     $fileSystem = $this->getFileSystem();
     $fileSystem->shouldReceive('exists')->once()->with('/sessions/123')->andReturn(true);
     $fileSystem->shouldReceive('isWritable')->once()->with('/sessions/123')->andReturn(true);
     $fileSystem->shouldReceive('delete')->once()->with('/sessions/123');
     $file = new File($fileSystem, '/sessions');
     $file->delete('123');
 }