if len(test.extensions) > 0 {
		var serverInfo bytes.Buffer
		for _, ext := range test.extensions {
			pem.Encode(&serverInfo, &pem.Block{
				Type:  fmt.Sprintf("SERVERINFO FOR EXTENSION %d", byteorder.BeUint16(ext)),
				Bytes: ext,
			})
		}
		serverInfoPath := tempFile(serverInfo.String())
		defer os.Remove(serverInfoPath)
		command = append(command, "-serverinfo", serverInfoPath)
	}