corti
v1.0.0
Published
Replace window.SpeechRecognition with a mock object and automate your tests
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Corti
Corti is a drop in replacement for the browser's SpeechRecognition object. It mocks the behaviour of the native object to facilitate automated testing, and provides a number of extra methods beyond the SpeechRecognition spec to help testing (e.g., to simulate speech in automated tests).
💡 To easily use Speech Recognition in your own project, check out annyang.
Getting Started
Installation
Install corti
as a dev dependency using npm:
npm install --save-dev corti
Usage
In node.js (ESM)
// Vitest example
import { SpeechRecognition } from 'corti';
import { describe, it, expect, beforeEach, beforeAll, afterAll, vi } from 'vitest';
beforeAll(() => {
vi.stubGlobal('SpeechRecognition', SpeechRecognition);
});
afterAll(() => {
vi.unstubAllGlobals();
});
describe('Mirror mirror on the wall', () => {
let recognition;
let spyFn;
beforeEach(() => {
recognition = new globalThis.SpeechRecognition();
spyFn = vi.fn();
recognition.maxAlternatives = 5;
recognition.onresult = spyFn;
recognition.start();
});
it('should call callback when called with a single sentence', () => {
recognition.say('Hello world');
expect(spyFn).toHaveBeenCalled();
const event = spyFn.mock.calls[0][0];
expect(event.results[0][0].transcript).toBe('Hello world');
});
it('should call callback when called with multiple sentences', () => {
recognition.say(['Hello world', 'How are you?']);
expect(spyFn).toHaveBeenCalled();
const event = spyFn.mock.calls[0][0];
expect(event.results[0][0].transcript).toBe('Hello world');
expect(event.results[0][1].transcript).toBe('How are you?');
});
});
In node.js (CJS)
// Jest example
const { SpeechRecognition } = require('corti');
beforeAll(() => {
global.SpeechRecognition = SpeechRecognition;
});
test('SpeechRecognition', () => {
const speech = new globalThis.SpeechRecognition();
const spyFn = jest.fn();
speech.onresult = spyFn;
speech.continuous = true;
speech.start();
speech.say('Hello world');
speech.say('Hello world');
expect(spyFn.mock.calls.length).toBe(2);
});
In Browser (ESM)
<script type="module">
// Mock native SpeechRecognition
import { SpeechRecognition } from 'corti.js';
window.SpeechRecognition = SpeechRecognition;
// Run some tests
const recognition = new window.SpeechRecognition();
recognition.onresult = () => console.log('I hear it!');
recognition.start();
recognition.say('Hello world');
</script>
In Browser (without modules)
<script src="../dist/corti.js"></script>
<script>
// Mock native SpeechRecognition
window.SpeechRecognition = corti.SpeechRecognition;
// Run some tests
const recognition = new window.SpeechRecognition();
recognition.onresult = () => console.log('I hear it!');
recognition.start();
recognition.say('Hello world');
</script>
For an example of how Corti is used in a real project, check out SpeechKITT.
Methods Mocked
start()
abort()
stop()
addEventListener()
Attributes Mocked
interimResults
lang
continuous
maxAlternatives
onstart
onend
onresult
onsoundstart
Events Mocked
start
end
result
soundstart
Objects Mocked
SpeechRecognition
SpeechRecognitionEvent
SpeechRecognitionResultList
SpeechRecognitionResult
SpeechRecognitionAlternative
Extra Utility Methods Added To Mocked SpeechRecognition Object
isStarted()
say()
Author
Tal Ater: @TalAter
License
Licensed under MIT.