### Question:
SeRequest implements Serializable { @Override public String toString() { return String.format("SeRequest:{REQUESTS = %s, SELECTOR = %s, KEEPCHANNELOPEN = %s}", getApduRequests(), getSeSelector(), channelState); } SeRequest(SeSelector seSelector, List<ApduRequest> apduRequests,
            ChannelState channelState, SeProtocol protocolFlag);  SeRequest(List<ApduRequest> apduRequests, ChannelState channelState); SeSelector getSeSelector(); List<ApduRequest> getApduRequests(); boolean isKeepChannelOpen(); SeProtocol getProtocolFlag(); @Override String toString();  }### Answer:
@Test public void toStringNull() { seRequest = new SeRequest(null, null, null, null); assertNotNull(seRequest.toString()); }