fix(printResult): tables included colors even when outputStream did not support it

lib/printResult.js

@@ -15,20 +15,27 @@ const defaults = {
   verbose: true
 }
 
+class TableWithoutColor extends Table {
+  constructor (opts = {}) {
+    super({ ...opts, style: { head: [], border: [] } })
+  }
+}
+
 const printResult = (result, opts) => {
   opts = Object.assign({}, defaults, opts)
   let strResult = ''
 
   if (opts.verbose) {
     const chalk = new Chalk.Instance(testColorSupport({ stream: opts.outputStream, alwaysReturn: true }))
+    const ColorSafeTable = chalk.level === 0 ? TableWithoutColor : Table
 
-    const shortLatency = new Table({
+    const shortLatency = new ColorSafeTable({
       head: asColor(chalk.cyan, ['Stat', '2.5%', '50%', '97.5%', '99%', 'Avg', 'Stdev', 'Max'])
     })
     shortLatency.push(asLowRow(chalk.bold('Latency'), asMs(result.latency)))
     logToLocalStr('\n' + shortLatency.toString())
 
-    const requests = new Table({
+    const requests = new ColorSafeTable({
       head: asColor(chalk.cyan, ['Stat', '1%', '2.5%', '50%', '97.5%', 'Avg', 'Stdev', 'Min'])
     })
 
@@ -37,7 +44,7 @@ const printResult = (result, opts) => {
     logToLocalStr(requests.toString())
 
     if (opts.renderStatusCodes === true) {
-      const statusCodeStats = new Table({
+      const statusCodeStats = new ColorSafeTable({
         head: asColor(chalk.cyan, ['Code', 'Count'])
       })
       Object.keys(result.statusCodeStats).forEach(statusCode => {
@@ -57,7 +64,7 @@ const printResult = (result, opts) => {
     logToLocalStr('')
 
     if (opts.renderLatencyTable) {
-      const latencies = new Table({
+      const latencies = new ColorSafeTable({
         head: asColor(chalk.cyan, ['Percentile', 'Latency (ms)'])
       })
       percentiles.map((perc) => {
@@ -85,7 +92,7 @@ const printResult = (result, opts) => {
     logToLocalStr(`${format(result.mismatches)} requests with mismatched body`)
   }
   if (result.resets) {
-    logToLocalStr(`request pipeline was resetted ${format(result.resets)} ${result.resets === 1 ? 'time' : 'times'}`)
+    logToLocalStr(`request pipeline was reset ${format(result.resets)} ${result.resets === 1 ? 'time' : 'times'}`)
   }
 
   function logToLocalStr (msg) {

package.json

@@ -38,6 +38,7 @@
   },
   "homepage": "https://github.com/mcollina/autocannon#readme",
   "devDependencies": {
+    "ansi-regex": "^5.0.1",
     "bl": "^6.0.0",
     "busboy": "^0.3.1",
     "pre-commit": "^1.1.2",

test/printResult.test.js

@@ -4,6 +4,8 @@ const test = require('tap').test
 const split = require('split2')
 const path = require('path')
 const childProcess = require('child_process')
+const { Writable } = require('stream')
+const ansiRegex = require('ansi-regex')
 const printResult = require('../lib/printResult')
 
 test('should stdout (print) the result', (t) => {
@@ -139,3 +141,96 @@ test('should not print when verbose(V=0) is false', (t) => {
   const output = printResult(result, { verbose: false })
   t.ok(output.split('\n').length === 2)
 })
+
+test('should print with color when color is supported', (t) => {
+  t.plan(1)
+
+  const connections = 10
+  const pipelining = 2
+  const result = {
+    connections,
+    pipelining,
+    latency: {},
+    requests: {
+      sent: connections * pipelining
+    },
+    throughput: {
+      average: 3319,
+      mean: 3319,
+      stddev: 0,
+      min: 3318,
+      max: 3318,
+      total: 3318,
+      p0_001: 3319,
+      p0_01: 3319,
+      p0_1: 3319,
+      p1: 3319,
+      p2_5: 3319,
+      p10: 3319,
+      p25: 3319,
+      p50: 3319,
+      p75: 3319,
+      p90: 3319,
+      p97_5: 3319,
+      p99: 3319,
+      p99_9: 3319,
+      p99_99: 3319,
+      p99_999: 3319
+    }
+  }
+
+  const outputStream = new Writable({
+    write () {}
+  })
+  outputStream.isTTY = true
+
+  // act
+  const output = printResult(result, { outputStream })
+  t.ok(ansiRegex().test(output))
+})
+
+test('should not print with any color when color is not supported', (t) => {
+  t.plan(1)
+
+  const connections = 10
+  const pipelining = 2
+  const result = {
+    connections,
+    pipelining,
+    latency: {},
+    requests: {
+      sent: connections * pipelining
+    },
+    throughput: {
+      average: 3319,
+      mean: 3319,
+      stddev: 0,
+      min: 3318,
+      max: 3318,
+      total: 3318,
+      p0_001: 3319,
+      p0_01: 3319,
+      p0_1: 3319,
+      p1: 3319,
+      p2_5: 3319,
+      p10: 3319,
+      p25: 3319,
+      p50: 3319,
+      p75: 3319,
+      p90: 3319,
+      p97_5: 3319,
+      p99: 3319,
+      p99_9: 3319,
+      p99_99: 3319,
+      p99_999: 3319
+    }
+  }
+
+  const outputStream = new Writable({
+    write () {}
+  })
+
+  // act
+  const output = printResult(result, { outputStream })
+  t.ok(!ansiRegex().test(output))
+})