├── .editorconfig
├── .eslintrc.js
├── .gitattributes
├── .gitignore
├── README.md
├── assert-audio.js
├── golden-master.jpg
├── index.html
├── mocha-audio-snapshots.js
├── mocha-audio.js
├── package-lock.json
├── package.json
├── sadtrombone-test.js
├── sadtrombone.js
├── snapshots
    ├── Sad Trombone should fail so that we can see the player.wav
    ├── Sad Trombone should render sad trombone with a faster tempo.wav
    └── Sad Trombone should render sad trombone.wav
└── test.html


/.editorconfig:
--------------------------------------------------------------------------------
 1 | # editorconfig.org
 2 | 
 3 | root = true
 4 | 
 5 | [*]
 6 | charset = utf-8
 7 | indent_size = 2
 8 | indent_style = space
 9 | insert_final_newline = true
10 | trim_trailing_whitespace = true
11 | 
12 | [*.md]
13 | trim_trailing_whitespace = false
14 | 


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/.eslintrc.js:
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 1 | module.exports = {
 2 |   "env": {
 3 |     "browser": true,
 4 |     "es6": true,
 5 |     "mocha": true
 6 |   },
 7 |   "extends": "eslint:recommended",
 8 |   "parserOptions": {
 9 |     "ecmaVersion": 2017,
10 |     "sourceType": "module"
11 |   },
12 |   "rules": {
13 |     "no-console": 0,
14 |     "indent": [
15 |       "error",
16 |       2
17 |     ],
18 |     "linebreak-style": [
19 |       "error",
20 |       "unix"
21 |     ],
22 |     "quotes": [
23 |       "error",
24 |       "single"
25 |     ],
26 |     "semi": [
27 |       "error",
28 |       "never"
29 |     ]
30 |   }
31 | };
32 | 


--------------------------------------------------------------------------------
/.gitattributes:
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https://raw.githubusercontent.com/salomvary/audio-snapshot-testing/6fffcd55edd5702e770084bc75aed9d8ac0f80f9/.gitattributes


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | .DS_Store
2 | node_modules
3 | npm-debug.log
4 | 


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/README.md:
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 1 | # Audio Snapshot Testing
 2 | 
 3 | ![The Voyager Golden Record](golden-master.jpg)
 4 | 
 5 | <small>[Image source: Wikipedia](https://commons.wikimedia.org/wiki/File:The_Sounds_of_Earth_-_GPN-2000-001976.jpg)</small>
 6 | 
 7 | ## What is snapshot testing?
 8 | 
 9 | Snapshot tests compare the **output of a previous known to be good** version
10 | of a system with the **output of the current version** to protect against 
11 | unintended changes.
12 | 
13 | Also known as *golden master testing* or *characterization testing*.
14 | 
15 | ## What can be snapshot tested?
16 | 
17 | Anything :)
18 | 
19 | - DOM tree rendered by a React component
20 | - Image generated on an HTML `<canvas>`
21 | - Generated binary data in an `ArrayBuffer`
22 | - Screenshot of a browser window or mobile app
23 | - **Sound generated by Web Audio API**
24 | 
25 | ## The snapshot testing workflow 
26 | 
27 | Set up the first snapshot
28 | 
29 | - Write a working implementation
30 | - Save the output into a snapshot file
31 | 
32 | Make some changes to the implementation
33 | 
34 | - Compare the new output with the old one
35 | - If the outputs are different,
36 |   manually verify the **new** output (listen to it)
37 | - If the new output sounds right (a change was intended),
38 |   **overwrite** the saved snapshots
39 | - Otherwise revert or fix the breaking changes
40 | 
41 | ## Practical Audio Snapshot testing
42 | 
43 | The problem: snapshot testing frameworks exist but
44 | no existing test framework supports **audio** snapshot testing.
45 | 
46 | "Tools" needed:
47 | 
48 | - Take an audio snapshot
49 | - Allow saving the snapshot to a file
50 | - Load the snapshot
51 | - Compare snapshots for difference
52 | - Manually verify snapshots
53 | 
54 | ## Proof of concept audio snapshot testing
55 | 
56 | This repo contains the basics needed for audio snapshot testing. It is not a
57 | fully elaborate framework, rather a draft implementation of an idea.
58 | 
59 | See the [the demo app](https://salomvary.com/audio-snapshot-testing/test.html)
60 | and the [test suite](https://salomvary.com/audio-snapshot-testing/test.html)
61 | running in the browser. Browse [the
62 | source](https://github.com/salomvary/audio-snapshot-testing/) to learn more
63 | about the details.
64 | 
65 | ## Gotchas
66 | 
67 | Verifying audio data is not as easy as precisely comparing sample values.
68 | For example there might be small differences in how browsers render web audio,
69 | which can be tolerated for the given use case.
70 | 
71 | As there is no Web Audio API in Node.JS the test need to be run in real
72 | browsers. [Karma test runner](http://karma-runner.github.io/latest/index.html)
73 | and [Headless Chrome](https://chromium.googlesource.com/chromium/src/+/lkgr/headless/README.md)
74 | are useful tools for automated testing.
75 | 
76 | It is also important to note that AudioContext and OfflineAudioContext are not
77 | exactly the same, using the latter for testing might be problematic especially
78 | when testing real-time operations on audio nodes.
79 | 
80 | ## Further reading
81 | 
82 | - [Snapshot Testing: Use With Care][1] by Randy Coulman
83 | - [What is Snapshot Testing?][2] on StackExchange (QA)
84 | - [Jest Snapshot Testing][3]
85 | 
86 | [1]: http://randycoulman.com/blog/2016/09/06/snapshot-testing-use-with-care/
87 | [2]: https://sqa.stackexchange.com/questions/29696/what-is-snapshot-testing
88 | [3]: https://jestjs.io/docs/en/snapshot-testing.html
89 | 


--------------------------------------------------------------------------------
/assert-audio.js:
--------------------------------------------------------------------------------
 1 | /**
 2 |  * Framework-agnostic assertion to verify if two AudioBuffers are "equal"
 3 |  *
 4 |  * @param {AudioBuffer} actual
 5 |  * @param {AudioBuffer} expected
 6 |  * @param {boolean} negate if true, verify buffers to be *not* equal
 7 |  *
 8 |  * @throws {Error} assertion error if the verification fails
 9 |  */
10 | export default function assertEqualAudioBuffer (actual, expected, negate) {
11 |   // Compare length and number of channels first
12 |   let isEqual = actual.duration === expected.duration &&
13 |     actual.numberOfChannels === expected.numberOfChannels &&
14 |     actual.length === expected.length
15 | 
16 |   // Compare the samples in all channels
17 |   for (
18 |     let channel = 0;
19 |     channel < actual.numberOfChannels && isEqual;
20 |     channel++
21 |   ) {
22 |     isEqual = floatArrayEqual(
23 |       actual.getChannelData(channel),
24 |       expected.getChannelData(channel)
25 |     )
26 |   }
27 | 
28 |   // Throw assertion error with `actual` and `expected` exposed
29 |   if (negate ? isEqual : !isEqual) {
30 |     const message = negate
31 |       ? 'expected ' + inspectBuffer(actual) + ' to not be an equal audio buffer to ' + inspectBuffer(expected)
32 |       : 'expected ' + inspectBuffer(actual) + ' to be an equal audio buffer to ' + inspectBuffer(expected)
33 |     const assertionError = new Error(message)
34 |     assertionError.actual = actual
35 |     assertionError.expected = expected
36 |     // When diffs are enabled Mocha turns AudioBuffers into useless strings
37 |     assertionError.showDiff = false
38 |     throw assertionError
39 |   }
40 | }
41 | 
42 | function inspectBuffer (buffer) {
43 |   return `Buffer(numberOfChannels: ${buffer.numberOfChannels}, duration: ${buffer.duration}, length: ${buffer.length})`
44 | }
45 | 
46 | // Magic number for how much difference between individual
47 | // samples is tolerated
48 | const sampleTolerance = 10e-2
49 | 
50 | function floatArrayEqual (a1, a2) {
51 |   const length = a1.length
52 | 
53 |   if (length !== a2.length) {
54 |     return false
55 |   }
56 |   if (length === 0) {
57 |     return true
58 |   }
59 |   let index = -1
60 |   while (++index < length) {
61 |     if (Math.abs(a1[index] - a2[index]) > sampleTolerance) {
62 |       return false
63 |     }
64 |   }
65 |   return true
66 | }
67 | 


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/golden-master.jpg:
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https://raw.githubusercontent.com/salomvary/audio-snapshot-testing/6fffcd55edd5702e770084bc75aed9d8ac0f80f9/golden-master.jpg


--------------------------------------------------------------------------------
/index.html:
--------------------------------------------------------------------------------
 1 | <!doctype html>
 2 | <html>
 3 |   <head>
 4 |     <title>🎺😢</title>
 5 |     <meta charset="utf-8">
 6 |     <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 7 |     <style>
 8 |       html {
 9 |         height: 100%;
10 |         font-family: sans-serif;
11 |         text-align: center;
12 |       }
13 |       body {
14 |         margin: 0;
15 |         min-height: 100%;
16 |         display: flex;
17 |         justify-content: center;
18 |         align-items: center;
19 |       }
20 |       button {
21 |         background: none;
22 |         font-size: 100px;
23 |         border-radius: 10px;
24 |         border-style: solid;
25 |         border-width: 2px;
26 |         padding: 10px;
27 |       }
28 |       #qrcode img {
29 |         margin: 0px auto;
30 |         width: 128px;
31 |         height: 128px;
32 |       }
33 |     </style>
34 |   </head>
35 |   <body>
36 |     <main>
37 |       <p>
38 |         <button>🎺😢</button>
39 |       </p>
40 |       <p>
41 |         <a href="test.html">Test suite</a> |
42 |         <a href="https://github.com/salomvary/audio-snapshot-testing/">GitHub</a>
43 |       </p>
44 |       <p>
45 |         <div id="qrcode"></div>
46 |       </p>
47 |     </main>
48 |     <script type="module">
49 |       import sadtrombone from './sadtrombone.js'
50 | 
51 |       const audioContext = new (window.AudioContext || window.webkitAudioContext)
52 |       const button = document.querySelector('button')
53 |       button.onclick = () => sadtrombone(audioContext)
54 |     </script>
55 |     <script src="//cdn.rawgit.com/davidshimjs/qrcodejs/gh-pages/qrcode.min.js"></script>
56 |     <script type="text/javascript">
57 |       new QRCode(document.getElementById('qrcode'), {
58 |         text: window.location.href,
59 |         width: 256,
60 |         height: 256
61 |       })
62 |     </script>
63 |   </body>
64 | </html>
65 | 


--------------------------------------------------------------------------------
/mocha-audio-snapshots.js:
--------------------------------------------------------------------------------
 1 | /**
 2 |  * Audio snapshot loader hook for Moacha
 3 |  *
 4 |  * Usage:
 5 |  *   beforeEach(fetchAudioSnapshots(new AudioContext()))
 6 |  *
 7 |  * The audio snapshot is fetched as WAV file under a URL generated from the test
 8 |  * name and exposed as an AudioBuffer at this.snapshot.
 9 |  *
10 |  * @param {AudioContext} audioCtx
11 |  * @returns {function} the beforeEach hook
12 |  */
13 | export function fetchAudioSnapshots (audioCtx) {
14 |   return async function fetchAudioSnapshots () {
15 |     // Load audio snapshot from an url derived from the test title
16 |     const url = 'snapshots/' + this.currentTest.fullTitle() + '.wav'
17 |     const arrayBuffer = await fetch(url, {credentials: 'same-origin'})
18 |       .then(response => {
19 |         if (response.ok) {
20 |           return response.arrayBuffer()
21 |         } else {
22 |           console.warn(
23 |             `Audio snapshot was not found for "${this.currentTest.fullTitle()}". ` +
24 |             `Make sure there is a WAV file at "${url}"`)
25 |         }
26 |       })
27 | 
28 |     // Decode the snapshot if available or replace with an empty buffer
29 |     const audioBuffer = arrayBuffer
30 |       ? await decodeAudioData(arrayBuffer)
31 |       : audioCtx.createBuffer(2, 2, 44100)
32 | 
33 |     this.snapshot = audioBuffer
34 |   }
35 | 
36 |   // Safari does not have the promise based API for decodeAudioDataxw
37 |   function decodeAudioData (arrayBuffer) {
38 |     return new Promise (function (resolve, reject) {
39 |       audioCtx.decodeAudioData(arrayBuffer, resolve, reject)
40 |     })
41 |   }
42 | }
43 | 


--------------------------------------------------------------------------------
/mocha-audio.js:
--------------------------------------------------------------------------------
  1 | /* global audioBufferToWav saveAs */
  2 | 
  3 | /**
  4 |  * Mocha HTML reporter extension to support audio snapshot teting
  5 |  *
  6 |  * Usage:
  7 |  *   const runner = mocha.run()
  8 |  *   mochaAudio(runner)
  9 |  *
 10 |  * @param {Runner} runner Mocha Runner instance
 11 |  */
 12 | export default function mochaAudio (runner) {
 13 |   const audioCtx = new (window.AudioContext || window.webkitAudioContext)()
 14 | 
 15 |   runner.on('fail', function onFail (test) {
 16 |     if (!(test.err.actual instanceof AudioBuffer && test.err.expected instanceof AudioBuffer)) {
 17 |       return
 18 |     }
 19 | 
 20 |     // The Mocha UI extension was inspired by
 21 |     // https://toucantoco.com/en/tech-blog/tech/visual-tdd
 22 | 
 23 |     try {
 24 |       // Add a wrapper element after the last test
 25 |       // (they are appended sequentially by Mocha)
 26 |       const testsReportsElements = document.getElementsByClassName('test')
 27 |       const testReport = testsReportsElements[testsReportsElements.length - 1]
 28 |       const wrapper = document.createElement('li')
 29 |       wrapper.className = 'mocha-audio-snapshots test'
 30 |       testReport.parentElement.appendChild(wrapper)
 31 | 
 32 |       // Append a player for the actual output
 33 |       addPlayer(wrapper, {
 34 |         title: 'Actual:',
 35 |         buffer: test.err.actual,
 36 |         fileName: test.fullTitle() + '.wav'
 37 |       })
 38 | 
 39 |       // Append a player for the expected output
 40 |       addPlayer(wrapper, {
 41 |         title: 'Expected:',
 42 |         buffer: test.err.expected,
 43 |         fileName: test.fullTitle() + '.wav'
 44 |       })
 45 |     } catch (e) {
 46 |       // Mocha swallows exceptions
 47 |       console.error('Error in audio snapshots reporter', e)
 48 |     }
 49 |   })
 50 | 
 51 |   function addPlayer (parent, {title, buffer, fileName}) {
 52 |     const label = document.createElement('span')
 53 |     label.textContent = title
 54 |     parent.appendChild(label)
 55 | 
 56 |     const playButton = document.createElement('button')
 57 |     playButton.innerHTML = '▶'
 58 |     label.appendChild(playButton)
 59 | 
 60 |     const downloadButton = document.createElement('button')
 61 |     downloadButton.innerHTML = '⬇︎'
 62 |     label.appendChild(downloadButton)
 63 | 
 64 |     let source
 65 | 
 66 |     function onEnded () {
 67 |       playButton.innerHTML = '▶'
 68 |       source = null
 69 |     }
 70 | 
 71 |     playButton.onclick = function onPlayClick () {
 72 |       if (source) {
 73 |         source.stop()
 74 |         source = null
 75 |         playButton.innerHTML = '▶'
 76 |       } else {
 77 |         source = audioCtx.createBufferSource()
 78 |         source.buffer = buffer
 79 |         source.connect(audioCtx.destination)
 80 |         source.start()
 81 |         source.onended = onEnded
 82 |         playButton.innerHTML = '◾'
 83 |       }
 84 |     }
 85 | 
 86 |     downloadButton.onclick = function onDownloadClick () {
 87 |       exportWav(buffer, fileName)
 88 |     }
 89 |   }
 90 | 
 91 |   function exportWav (buffer, fileName) {
 92 |     const data = audioBufferToWav(buffer)
 93 |     const blob = new Blob(
 94 |       [new DataView(data)], {
 95 |         type: 'audio/wav'
 96 |       })
 97 |     saveAs(blob, fileName)
 98 |   }
 99 | }
100 | 


--------------------------------------------------------------------------------
/package-lock.json:
--------------------------------------------------------------------------------
  1 | {
  2 |   "name": "audio-snapshot-testing",
  3 |   "version": "1.0.0",
  4 |   "lockfileVersion": 1,
  5 |   "requires": true,
  6 |   "dependencies": {
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127 |       }
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--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "audio-snapshot-testing",
 3 |   "version": "1.0.0",
 4 |   "description": "",
 5 |   "main": "index.js",
 6 |   "scripts": {
 7 |     "test": "echo \"Error: no test specified\" && exit 1"
 8 |   },
 9 |   "keywords": [],
10 |   "author": "",
11 |   "license": "MIT",
12 |   "devDependencies": {
13 |     "eslint": "^5.9.0"
14 |   }
15 | }
16 | 


--------------------------------------------------------------------------------
/sadtrombone-test.js:
--------------------------------------------------------------------------------
 1 | import sadtrombone from './sadtrombone.js'
 2 | import {fetchAudioSnapshots} from './mocha-audio-snapshots.js'
 3 | 
 4 | const OfflineCtx = window.OfflineAudioContext || window.webkitOfflineAudioContext
 5 | const audioCtx = new (window.AudioContext || window.webkitAudioContext)()
 6 | 
 7 | describe('Sad Trombone', function () {
 8 |   beforeEach(fetchAudioSnapshots(audioCtx))
 9 | 
10 |   it('should render sad trombone', async function () {
11 |     const rendered = await render(1.8, (offlineCtx) => {
12 |       sadtrombone(offlineCtx)
13 |     })
14 | 
15 |     rendered.should.be.eqlAudio(this.snapshot)
16 |   })
17 | 
18 |   it('should render sad trombone with a faster tempo', async function () {
19 |     const rendered = await render(0.6, (offlineCtx) => {
20 |       const tempo = 0.15
21 |       sadtrombone(offlineCtx, tempo)
22 |     })
23 | 
24 |     rendered.should.be.eqlAudio(this.snapshot)
25 |   })
26 | 
27 |   it('should fail so that we can see the player', async function () {
28 |     const rendered = await render(1.8, (offlineCtx) => {
29 |       sadtrombone(offlineCtx)
30 |     })
31 | 
32 |     rendered.should.be.eqlAudio(this.snapshot)
33 |   })
34 | })
35 | 
36 | /**
37 |  * Render audio output to an "offline buffer"
38 |  *
39 |  * @param {number} length the length of the buffer to capture in seconds
40 |  * @param {function} fn
41 |  * @returns {AudioBuffer} the rendered buffer
42 |  */
43 | async function render (length, fn) {
44 |   const offlineCtx = new OfflineCtx(2, length * 44100, 44100)
45 |   fn(offlineCtx)
46 |   offlineCtx.startRendering()
47 |   // Safari does not have the promise based API for startRendering
48 |   return new Promise(function (resolve) {
49 |     offlineCtx.oncomplete = (e) => {
50 |       resolve(e.renderedBuffer)
51 |     }
52 |   })
53 | }
54 | 


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/sadtrombone.js:
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 1 | /**
 2 |  * A simple synth that plays a short but sad tune :(
 3 |  *
 4 |  * @param {AudioContext} audioContext
 5 |  */
 6 | export default function sadtrombone (audioContext, tempo = 0.3) {
 7 |   const base = 300
 8 |   const step = 6/5
 9 | 
10 |   const osc = audioContext.createOscillator()
11 |   osc.type = 'sawtooth'
12 |   osc.connect(audioContext.destination)
13 |   osc.start()
14 | 
15 |   playNote(0, 0)
16 |   playNote(1, 1)
17 |   playNote(2, 2)
18 |   playNote(3, 3)
19 |   stop(6)
20 | 
21 |   function playNote (note, start) {
22 |     const frequency = base / Math.pow(step, note)
23 |     const time = audioContext.currentTime + start * tempo
24 |     osc.frequency.setValueAtTime(frequency, time)
25 |   }
26 | 
27 |   function stop (time) {
28 |     osc.stop(audioContext.currentTime + time * tempo)
29 |   }
30 | }
31 | 
32 | 


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/snapshots/Sad Trombone should fail so that we can see the player.wav:
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https://raw.githubusercontent.com/salomvary/audio-snapshot-testing/6fffcd55edd5702e770084bc75aed9d8ac0f80f9/snapshots/Sad Trombone should fail so that we can see the player.wav


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/snapshots/Sad Trombone should render sad trombone with a faster tempo.wav:
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https://raw.githubusercontent.com/salomvary/audio-snapshot-testing/6fffcd55edd5702e770084bc75aed9d8ac0f80f9/snapshots/Sad Trombone should render sad trombone with a faster tempo.wav


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/snapshots/Sad Trombone should render sad trombone.wav:
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https://raw.githubusercontent.com/salomvary/audio-snapshot-testing/6fffcd55edd5702e770084bc75aed9d8ac0f80f9/snapshots/Sad Trombone should render sad trombone.wav


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/test.html:
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 1 | <html>
 2 | <head>
 3 |   <meta charset="utf-8">
 4 |   <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 5 |   <title>Audio Snapshot Testing</title>
 6 |   <link href="https://unpkg.com/mocha@5.2.0/mocha.css" rel="stylesheet" />
 7 |   <style>
 8 |     .mocha-audio-snapshots {
 9 |       font-size: 12px;
10 |       color: #c00;
11 |       line-height: 30px;
12 |     }
13 | 
14 |     .mocha-audio-snapshots button {
15 |       width: 30px;
16 |       height: 30px;
17 |       font-size: 20px;
18 |       padding: 0;
19 |       margin: 0 0.2em;
20 |       background: 0;
21 |       border-width: 1px;
22 |       border-style: solid;
23 |       border-radius: 3px;
24 |       vertical-align: middle;
25 |       outline: none;
26 |     }
27 |   </style>
28 | </head>
29 | <body>
30 |   <div id="mocha"></div>
31 | 
32 |   <script>module = {} // audiobuffer-to-wav assumes CommonJS </script>
33 |   <script src="https://unpkg.com/chai/chai.js"></script>
34 |   <script src="https://unpkg.com/mocha@5.2.0/mocha.js"></script>
35 |   <script src="https://unpkg.com/audiobuffer-to-wav@1.0.0/index.js"></script>
36 |   <script src="https://unpkg.com/file-saver@2.0.0/dist/FileSaver.js"></script>
37 | 
38 |   <script>
39 |     chai.should()
40 |     mocha.setup('bdd')
41 |   </script>
42 | 
43 |   <script type="module">
44 |     import './sadtrombone-test.js'
45 |     import mochaAudio from './mocha-audio.js'
46 |     import assertEqualAudioBuffer from './assert-audio.js'
47 | 
48 |     chai.use(function (_chai, utils) {
49 |       chai.Assertion.addMethod('eqlAudio', function (expected) {
50 |         const actual = utils.flag(this, 'object')
51 |         const negate = utils.flag(this, 'negate')
52 |         assertEqualAudioBuffer(actual, expected, negate)
53 |       })
54 |     })
55 | 
56 |     const runner = mocha.run()
57 |     mochaAudio(runner)
58 |   </script>
59 | </body>
60 | </html>
61 | 


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