Makes it possible to copy files from a modified file url
Наследование: extends Composer\Util\RemoteFilesystem
 public function testCopyUsesAcfFileUrl()
 {
     $acfFileUrl = 'file://' . __FILE__;
     $rfs = new RemoteFilesystem($acfFileUrl, $this->io);
     $file = tempnam(sys_get_temp_dir(), 'pb');
     $this->assertTrue($rfs->copy('http://example.org', 'does-not-exist', $file));
     $this->assertFileExists($file);
     unlink($file);
 }