@signalk/nmea0183-signalk/test/VWT.js

A node.js/javascript parser for NMEA0183 sentences. Sentences are parsed to Signal K format.

'use strict'

const Parser = require('../lib')
const chai = require('chai')
const should = chai.Should()

chai.use(require('chai-things'))

describe('VWT', () => {
  it('speed & direction data (#1)', () => {
    const delta = new Parser().parse('$IIVWT,030.,R,10.1,N,05.2,M,018.7,K*75')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.equal(5.2)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(0.523599, 0.005)
  })

  it('speed & direction data (#2)', () => {
    const delta = new Parser().parse('$IIVWT,180.,R,10.1,N,05.2,M,018.7,K*7F')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.equal(5.2)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(3.1415, 0.005)
  })

  it('speed & direction data (#3)', () => {
    // 190R = 170L
    const delta = new Parser().parse('$IIVWT,190.,R,10.1,N,05.2,M,018.7,K*7E')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.equal(5.2)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(-2.967, 0.005)
  })

  it('speed & direction data (#4)', () => {
    const delta = new Parser().parse('$IIVWT,170.,L,10.1,N,05.2,M,018.7,K*6E')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.equal(5.2)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(-2.967, 0.005)
  })

  it('speed & direction data (#5)', () => {
    // 170 + 360 = 530
    const delta = new Parser().parse('$IIVWT,530.,L,10.1,N,05.2,M,018.7,K*6E')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.equal(5.2)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(-2.967, 0.005)
  })

  it('missing speed data (#1)', () => {
    const delta = new Parser().parse('$IIVWT,030.,R,,N,05.2,M,018.7,*20')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.equal(5.2)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(0.523599, 0.005)
  })

  it('missing speed data (#2)', () => {
    const delta = new Parser().parse('$IIVWT,030.,R,10.1,N,,,018.7,K*21')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.be.closeTo(5.2, 0.05)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(0.523599, 0.005)
  })

  it('missing speed data (#3)', () => {
    const delta = new Parser().parse('$IIVWT,030.,R,10.1,N,,,,K*01')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.be.closeTo(5.2, 0.05)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(0.523599, 0.005)
  })

  it('missing direction data (#1)', () => {
    const delta = new Parser().parse('$IIVWT,,R,10.1,N,,,,K*1C')

    should.equal(delta, null)
  })

  it('missing direction data (#2)', () => {
    const delta = new Parser().parse('$IIVWT,0.0,,10.1,N,,,,K*60')

    should.equal(delta, null)
  })

  it('improper direction designator (#1)', () => {
    const delta = new Parser().parse('$IIVWT,030.,r,10.1,N,05.2,M,018.7,K*55')

    should.equal(delta, null)
  })

  it('improper speed designator (#1)', () => {
    const delta = new Parser().parse('$IIVWT,030.,R,10.1,X,05.2,M,018.7,X*70')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.equal(5.2)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(0.523599, 0.005)
  })

  it('improper speed designator (#2)', () => {
    const delta = new Parser().parse('$IIVWT,030.,R,10.1,N,05.2,X,018.7,K*60')

    delta.updates[0].values[0].path.should.equal('environment.wind.speedTrue')
    delta.updates[0].values[0].value.should.be.closeTo(5.2, 0.05)
    delta.updates[0].values[1].path.should.equal(
      'environment.wind.angleTrueWater'
    )
    delta.updates[0].values[1].value.should.be.closeTo(0.523599, 0.005)
  })

  it('improper speed designator (#3)', () => {
    const delta = new Parser().parse('$IIVWT,030.,R,10.1,X,05.2,X,018.7,X*65')

    should.equal(delta, null)
  })

  it("Doesn't choke on empty sentences", () => {
    const delta = new Parser().parse('$IIVWT,,,,*55')
    should.equal(delta, null)
  })
})