bacstack/test/unit/npdu.spec.js

A BACnet protocol stack written in pure JavaScript.

'use strict';

const utils = require('./utils');
const baNpdu = require('../../lib/npdu');

describe('bacstack - NPDU layer', () => {
  it('should successfully decode the NPDU function', () => {
    const result = baNpdu.decodeFunction([0, 1, 12], 1);
    expect(result).toEqual(12);
  });

  it('should fail decoding the NPDU function if invalid version', () => {
    const result = baNpdu.decodeFunction([0, 2, 12], 1);
    expect(result).toBeUndefined();
  });

  it('should successfully encode and decode a basic NPDU package', () => {
    const buffer = utils.getBuffer();
    baNpdu.encode(buffer, 1);
    const result = baNpdu.decode(buffer.buffer, 0);
    expect(result).toEqual({
      len: 2,
      funct: 1,
      destination: undefined,
      source: undefined,
      hopCount: 0,
      networkMsgType: 0,
      vendorId: 0
    });
  });

  it('should successfully encode and decode a NPDU package with destination', () => {
    const buffer = utils.getBuffer();
    const destination = {net: 1000, adr: [1, 2, 3]};
    baNpdu.encode(buffer, 1, destination, undefined, 11, 5, 7);
    const result = baNpdu.decode(buffer.buffer, 0);
    expect(result).toEqual({
      len: 9,
      funct: 33,
      destination: {type: 0, net: 1000, adr: [1, 2, 3]},
      source: undefined,
      hopCount: 11,
      networkMsgType: 0,
      vendorId: 0
    });
  });

  it('should successfully encode and decode a NPDU package with destination and source', () => {
    const buffer = utils.getBuffer();
    const destination = {net: 1000, adr: [1, 2, 3]};
    const source = {net: 1000, adr: [1, 2, 3]};
    baNpdu.encode(buffer, 1, destination, source, 13, 10, 11);
    const result = baNpdu.decode(buffer.buffer, 0);
    expect(result).toEqual({
      len: 15,
      funct: 41,
      destination: {type: 0, net: 1000, adr: [1, 2, 3]},
      source: {type: 0, net: 1000, adr: [1, 2, 3]},
      hopCount: 13,
      networkMsgType: 0,
      vendorId: 0
    });
  });

  it('should successfully encode and decode a NPDU package with broadcast destination and source', () => {
    const buffer = utils.getBuffer();
    const destination = {net: 65535};
    const source = {net: 1000};
    baNpdu.encode(buffer, 1, destination, source, 12, 8, 9);
    const result = baNpdu.decode(buffer.buffer, 0);
    expect(result).toEqual({
      len: 9,
      funct: 41,
      destination: {type: 0, net: 65535},
      source: {type: 0, net: 1000},
      hopCount: 12,
      networkMsgType: 0,
      vendorId: 0
    });
  });

  it('should successfully encode and decode a network layer NPDU package', () => {
    const buffer = utils.getBuffer();
    baNpdu.encode(buffer, 128, undefined, undefined, 1, 128, 7777);
    const result = baNpdu.decode(buffer.buffer, 0);
    expect(result).toEqual({
      len: 5,
      funct: 128,
      destination: undefined,
      source: undefined,
      hopCount: 0,
      networkMsgType: 128,
      vendorId: 7777
    });
  });

  it('should successfully encode and decode a who is router to network layer NPDU package', () => {
    const buffer = utils.getBuffer();
    baNpdu.encode(buffer, 128, undefined, undefined, 1, 0, 7777);
    const result = baNpdu.decode(buffer.buffer, 0);
    expect(result).toEqual({
      len: 5,
      funct: 128,
      destination: undefined,
      source: undefined,
      hopCount: 0,
      networkMsgType: 0,
      vendorId: 0
    });
  });

  it('should fail if invalid BACNET version', () => {
    const buffer = utils.getBuffer();
    baNpdu.encode(buffer, 12, undefined, undefined, 1, 2, 3);
    buffer.buffer[0] = 2;
    const result = baNpdu.decode(buffer.buffer, 0);
    expect(result).toBeUndefined();
  });
});