`@inquirer/testing`

The @inquirer/testing package is Inquirer's answer to testing prompts built with @inquirer/core.

Special Thanks

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Installation

npm	yarn
npm install @inquirer/testing --save-dev	yarn add @inquirer/testing --dev

Example

Here's an example of a test running with Jest (though @inquirer/testing will work with any runners).

import { render } from '@inquirer/testing';
import input from './src/index.mjs';

describe('input prompt', () => {
  it('handle simple use case', async () => {
    const { answer, events, getScreen } = await render(input, {
      message: 'What is your name',
    });

    expect(getScreen()).toMatchInlineSnapshot(`"? What is your name"`);

    events.type('J');
    expect(getScreen()).toMatchInlineSnapshot(`"? What is your name J"`);

    events.type('ohn');
    events.keypress('enter');
    // or events.keypress({ name: 'enter' })

    await expect(answer).resolves.toEqual('John');
    expect(getScreen()).toMatchInlineSnapshot(`"? What is your name John"`);
  });
});

Usage

The core utility of @inquirer/testing is the render() function. This render function will create and instrument a command line like interface.

render takes 2 arguments:

The Inquirer prompt to test (the return value of createPrompt())
The prompt configuration (the first prompt argument)

render then returns a promise that will resolve once the prompt is rendered and the test environment up and running. This promise returns the utilities we'll use to interact with our tests:

answer (Promise) This is the promise that'll be resolved once an answer is provided and valid.
getScreen (({ raw: boolean }) => string) This function returns the state of what is printed on the command line screen at any given time. You can use its return value to validate your prompt is properly rendered. By default this function will strip the ANSI codes (used for colors.)
events ({ keypress: (name | Key) => void, type: (string) => void }) Is the utilities allowing you to interact with the prompt. Use it to trigger keypress events, or typing any input.
getFullOutput (() => string) Return a raw dump of everything that got sent on the output stream.

You can refer to the @inquirer/input prompt test suite as a practical example.