@lwc/test-utils NPM | npm.io

0.33.27-alpha1 • Published 7 years ago

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Weekly downloads

674

License

MIT

Repository

Last release

7 years ago

lwc-test-utils

A collection of utility functions to assist in unit testing Lightning web components.

Usage

Usage of this library assumes you have the a Lightning Web Component development and test environment setup. To get started with testing your Lightning web components see the documentation website.

Direct Import

Add this package as a devDependency and import the utils directly into your test.

yarn add -D '@lwc/test-utils'

In your test:

import { getShadowRoot } from '@lwc/test-utils';

// create element under test and query for custom element in the Shadow DOM
const element = createElement('my-custom-component', { is: MyCustomComponent });
document.body.appendChild(element);
const shadowRoot = getShadowRoot(element);
const fancyButton = shadowRoot.querySelector('fancy-button');

Jest Preset Configuration

This util also comes pre-packed in lwc-jest-preset.

yarn add -D 'lwc-jest-preset'

In your package.json:

"jest": {
    "preset": "lwc-jest-preset",
    "moduleNameMapper": {
        "^(mynamespace)-(.+)$": "<rootDir>/src/$1/$2/$2"
    }
}

Or in jest.config.js:

const PRESET_CONFIG = require('lwc-jest-preset');
module.exports = {
    ...PRESET_CONFIG,
    moduleNameMapper: {
        ...PRESET_CONFIG.moduleNameMapper,
        '^(mynamespace)-(.+)$': '<rootDir>/src/$1/$2/$2'
    },
};

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