1 | 'use strict'
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2 |
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3 | const test = require('tap').test
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4 | const async = require('async')
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5 | const summary = require('summary')
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6 | const endpoint = require('endpoint')
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7 | const CollectAndRead = require('./collect-and-read.js')
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8 |
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9 | function diff (data) {
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10 | const output = []
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11 | let last = data[0]
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12 | for (let i = 1; i < data.length; i++) {
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13 | output.push(data[i] - last)
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14 | last = data[i]
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15 | }
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16 | return output
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17 | }
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18 |
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19 | test('cmd - collect - custom sample interval', function (t) {
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20 | const cmd = new CollectAndRead({
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21 | sampleInterval: 100
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22 | }, '-e', 'setTimeout(() => {}, 1000)')
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23 |
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24 | cmd.on('error', t.ifError.bind(t))
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25 | cmd.on('ready', function () {
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26 | async.parallel({
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27 | traceEvent (done) {
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28 | cmd.traceEvent.pipe(endpoint({ objectMode: true }, done))
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29 | },
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30 |
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31 | processStat (done) {
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32 | cmd.processStat.pipe(endpoint({ objectMode: true }, done))
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33 | }
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34 | }, function (err, output) {
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35 | if (err) return t.ifError(err)
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36 |
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37 |
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38 | const sampleTimes = output.processStat.map((stat) => stat.timestamp)
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39 | const timeSeparation = summary(diff(sampleTimes)).mean()
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40 | t.ok(sampleTimes.length > 0, 'data is outputted')
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41 | const drift = Math.abs(timeSeparation - 100)
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42 | t.comment(`drift is ${drift}`)
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43 | t.ok(drift < 100)
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44 |
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45 | t.end()
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46 | })
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47 | })
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48 | })
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