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

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

/**
 * Copyright 2016 Signal K and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict'

const Parser = require('../lib')
const chai = require('chai')
const expect = chai.expect

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

describe('VTG', () => {
  it('Converts OK using individual parser', () => {
    const delta = new Parser().parse('$GPVTG,0.0,T,359.3,M,0.0,N,0.0,K,A*2F')

    delta.updates[0].values.should.contain.an.item.with.property(
      'path',
      'navigation.courseOverGroundMagnetic'
    )
    delta.updates[0].values[0].value.should.be.closeTo(6.271, 0.005)

    delta.updates[0].values.should.contain.an.item.with.property(
      'path',
      'navigation.courseOverGroundTrue'
    )
    delta.updates[0].values[1].value.should.equal(0)

    delta.updates[0].values.should.contain.an.item.with.property(
      'path',
      'navigation.speedOverGround'
    )
    delta.updates[0].values[2].value.should.equal(0)
  })

  it('Outputs nulls for missing values', () => {
    const delta = new Parser().parse('$GPVTG,,T,,M,0.102,N,0.190,K,A*28')

    delta.updates[0].values.should.contain.an.item.with.property(
      'path',
      'navigation.courseOverGroundMagnetic'
    )
    expect(delta.updates[0].values[0].value).to.be.null

    delta.updates[0].values.should.contain.an.item.with.property(
      'path',
      'navigation.courseOverGroundTrue'
    )
    expect(delta.updates[0].values[1].value).to.be.null

    delta.updates[0].values.should.contain.an.item.with.property(
      'path',
      'navigation.speedOverGround'
    )
    delta.updates[0].values[2].value.should.be.closeTo(0.0528, 0.00005)
  })

})