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QuiiBzTom Lienard
QuiiBz
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Tom Lienard
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feat(jest-helpers): add jest-helpers package (#432)
* feat(jest-helpers): add jest-helpers package * chore(deps): update deps * docs: add readme * fix(jest-helpers): eslint no-extraenous-dependencies * chore(deps): add @testing-library/react to peerDeps * chore(jest-helpers): add doc to methods fields in readme * chore(deps): update deps * refactor(jest-helpers): remove initializeIfNeeded * feat(jest-helpers): add tests Co-authored-by: Tom Lienard <[email protected]>
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‎README.md‎

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@@ -78,6 +78,12 @@ scaleway-lib is a set of NPM packages used at Scaleway.
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![npm bundle size](https://img.shields.io/bundlephobia/min/@scaleway/regex)
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![npm](https://img.shields.io/npm/v/@scaleway/regex)
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- [`@scaleway/jest-helpers`](./packages/jest-helpers/README.md): utilities jest functions.
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![npm](https://img.shields.io/npm/dm/@scaleway/jest-helpers)
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![npm bundle size](https://img.shields.io/bundlephobia/min/@scaleway/jest-helpers)
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![npm](https://img.shields.io/npm/v/@scaleway/jest-helpers)
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## Development
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### Locally

‎packages/jest-helpers/.npmignore‎

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**/__tests__/**
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src
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!.npmignore

‎packages/jest-helpers/README.md‎

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# `@scaleway/jest-helpers`
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## A package for utilities jest functions
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## Install
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```bash
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$ yarn add @scaleway/jest-functions
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```
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## How to use
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### Create the helpers functions
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```tsx
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import makeHelpers from '@scaleway/jest-helpers'
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const Wrapper = ({ children }) => (
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<ThemeProvider>{children}</ThemeProvider>
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)
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export const {
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renderWithTheme,
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shouldMatchEmotionSnapshot,
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shouldMatchEmotionSnapshotWithPortal,
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} = makeHelpers(Wrapper)
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```
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#### With a theme prop
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```tsx
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import makeHelpers from '@scaleway/jest-helpers'
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import defaultTheme from '..'
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interface WrapperProps {
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theme?: typeof defaultTheme
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}
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const Wrapper = ({ theme, children }) => (
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<ThemeProvider theme={theme}>{children}</ThemeProvider>
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)
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export const {
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renderWithTheme,
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shouldMatchEmotionSnapshot,
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shouldMatchEmotionSnapshotWithPortal,
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} = makeHelpers(Wrapper)
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```
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#### With CreateSerializerOptions
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```tsx
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import makeHelpers from '@scaleway/jest-helpers'
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const Wrapper = ({ children }) => (
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<ThemeProvider>{children}</ThemeProvider>
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)
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export const {
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renderWithTheme,
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shouldMatchEmotionSnapshot,
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shouldMatchEmotionSnapshotWithPortal,
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} = makeHelpers(Wrapper, { classNameReplacer: className => className })
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```
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### renderWithTheme
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Automatically uses `CacheProvider` from `@emotion/cache`. Use it with a component, optional options & optional theme.
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```tsx
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const renderWithTheme = (
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component: ReactNode, // The component to render
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options?: RenderOptions, // RenderOptions from @testing-library/react
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theme?: Theme, // Optional theme to use which will be passed to the Wrapper above
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) => ReturnType<typeof render>
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```
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### shouldMatchEmotionSnapshot / shouldMatchEmotionSnapshotWithPortal
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Internally it uses the `renderWithTheme` generated from above.
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```tsx
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const shouldMatchEmotionSnapshot = (
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component: ReactNode, // The component to render
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options: { // In an object to make it backward-compatible and don't introduce any API breaking changes
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options?: RenderOptions // RenderOptions from @testing-library/react
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transform?: (node: ReturnType<typeof render>) => Promise<void> | void // (a)sync function execute between the render and the expect. You can use this if you need mockAllIsIntersecting
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theme?: Theme // Optional theme to use which will be passed to the Wrapper above
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},
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) => Promise<void>
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```

‎packages/jest-helpers/package.json‎

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{
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"name": "@scaleway/jest-helpers",
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"version": "1.0.0",
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"description": "A package for utilities jest functions",
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"type": "module",
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"main": "dist/index.js",
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"module": "dist/index.js",
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"types": "dist/index.d.ts",
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"publishConfig": {
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"access": "public"
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},
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"repository": {
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"type": "git",
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"url": "https://github.com/scaleway/scaleway-lib",
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"directory": "packages/jest-helpers"
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},
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"license": "MIT",
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"dependencies": {
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"@emotion/cache": "^11.1.3",
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"@emotion/jest": "^11.3.0",
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"@emotion/react": "^11.1.4",
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"@testing-library/react": "^12.1.2"
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},
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"devDependencies": {
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"@types/react": "^17.0.27"
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},
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"peerDependencies": {
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"react": "^17.0.1"
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}
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}

‎packages/jest-helpers/src/__tests__/__snapshots__/index.test.tsx.snap‎

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// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`@jest-helpers should call tranform with shouldMatchEmotionSnapshot 1`] = `
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<DocumentFragment>
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<div
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id="wrapper"
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>
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<div
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id="test"
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/>
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</div>
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</DocumentFragment>
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`;
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exports[`@jest-helpers should call transform with shouldMatchEmotionSnapshot 1`] = `
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<DocumentFragment>
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<div
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id="wrapper"
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>
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<div
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id="test"
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/>
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</div>
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</DocumentFragment>
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`;
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exports[`@jest-helpers should render with renderWithTheme 1`] = `
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<div
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data-testid="test"
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/>
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`;
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exports[`@jest-helpers should render with shouldMatchEmotionSnapshot 1`] = `
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<DocumentFragment>
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<div
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id="wrapper"
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>
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<div
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id="test"
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/>
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</div>
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</DocumentFragment>
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`;
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exports[`@jest-helpers should render with shouldMatchEmotionSnapshotWithPortal 1`] = `
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<DocumentFragment>
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<div
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id="wrapper"
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>
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<div
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id="test"
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/>
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</div>
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</DocumentFragment>
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`;

‎packages/jest-helpers/src/__tests__/index.test.tsx‎

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import React from 'react'
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import makeHelpers from ".."
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import { RenderWithThemeFn } from "../helpers/renderWithTheme"
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import { ShouldMatchEmotionSnapshotFn } from '../helpers/shouldMatchEmotionSnapshot'
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import { ShouldMatchEmotionSnapshotWithPortalFn } from '../helpers/shouldMatchEmotionSnapshotWithPortal'
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describe('@jest-helpers', () => {
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let renderWithTheme: RenderWithThemeFn<unknown>
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let shouldMatchEmotionSnapshot: ShouldMatchEmotionSnapshotFn<unknown>
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let shouldMatchEmotionSnapshotWithPortal: ShouldMatchEmotionSnapshotWithPortalFn<unknown>
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beforeAll(() => {
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const helpers = makeHelpers(({ children }) => (
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<div id="wrapper">
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{children}
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</div>
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))
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renderWithTheme = helpers.renderWithTheme
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shouldMatchEmotionSnapshot = helpers.shouldMatchEmotionSnapshot
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shouldMatchEmotionSnapshotWithPortal = helpers.shouldMatchEmotionSnapshotWithPortal
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})
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test('should render with renderWithTheme', () => {
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const node = renderWithTheme(<div data-testid="test" />)
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const element = node.getByTestId("test")
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expect(element).toMatchSnapshot()
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})
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test('should render with shouldMatchEmotionSnapshot', async () => {
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await shouldMatchEmotionSnapshot(<div id="test" />)
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})
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test('should call tranform with shouldMatchEmotionSnapshot', async () => {
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const transform = jest.fn()
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await shouldMatchEmotionSnapshot(<div id="test" />, { transform })
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expect(transform).toHaveBeenCalledTimes(1)
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})
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test('should render with shouldMatchEmotionSnapshotWithPortal', async () => {
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await shouldMatchEmotionSnapshotWithPortal(<div id="test" />)
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})
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it('should call transform with shouldMatchEmotionSnapshot', async () => {
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const transform = jest.fn()
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await shouldMatchEmotionSnapshotWithPortal(<div id="test" />, { transform })
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expect(transform).toHaveBeenCalledTimes(1)
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})
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})

‎packages/jest-helpers/src/helpers/renderWithTheme.tsx‎

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import createCache from '@emotion/cache'
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import { CacheProvider } from '@emotion/react'
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import { RenderOptions, render } from '@testing-library/react'
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import React, { FC, ReactNode } from 'react'
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const emotionCache = createCache({
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key: 'cache',
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})
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emotionCache.compat = true
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export type RenderWithThemeFn<Theme> = (component: ReactNode, options?: RenderOptions, theme?: Theme) => ReturnType<typeof render>
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export default function makeRenderWithTheme<Theme>(Wrapper: FC<{ theme?: Theme }>): RenderWithThemeFn<Theme> {
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return (component, options, theme) => render(
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<CacheProvider value={emotionCache}>
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<Wrapper theme={theme}>
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{component}
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</Wrapper>
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</CacheProvider>,
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options,
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)
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}

‎packages/jest-helpers/src/helpers/shouldMatchEmotionSnapshot.ts‎

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import { RenderOptions, render } from '@testing-library/react'
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import { ReactNode } from 'react'
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import { RenderWithThemeFn } from './renderWithTheme'
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interface Options<Theme> {
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options?: RenderOptions
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transform?: (node: ReturnType<typeof render>) => Promise<void> | void
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theme?: Theme
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}
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export type ShouldMatchEmotionSnapshotFn<Theme> = (component: ReactNode, options?: Options<Theme>) => Promise<void>
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export default function makeShouldMatchEmotionSnapshot<Theme>(renderWithTheme: RenderWithThemeFn<Theme>): ShouldMatchEmotionSnapshotFn<Theme> {
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return async (component, { options, transform, theme } = {}) => {
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const node = renderWithTheme(component, options, theme)
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if (transform) await transform(node)
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expect(node.asFragment()).toMatchSnapshot()
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node.unmount()
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}
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}

‎packages/jest-helpers/src/helpers/shouldMatchEmotionSnapshotWithPortal.ts‎

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import { RenderOptions, render } from '@testing-library/react'
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import { ReactNode } from 'react'
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import { RenderWithThemeFn } from './renderWithTheme'
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interface Options<Theme> {
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options?: RenderOptions
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transform?: (node: ReturnType<typeof render>) => Promise<void> | void
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theme?: Theme
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}
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export type ShouldMatchEmotionSnapshotWithPortalFn<Theme> = (component: ReactNode, options?: Options<Theme>) => Promise<void>
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export default function makeShouldMatchEmotionSnapshotWithPortal<Theme>(renderWithTheme: RenderWithThemeFn<Theme>): ShouldMatchEmotionSnapshotWithPortalFn<Theme> {
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return async (component, { options, transform, theme } = {}) => {
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// Save the instance of console (disable warning about adding element directly to document.body which is necessary when testing portal components)
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const { console } = global
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global.console = { ...console, error: jest.fn() }
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const node = renderWithTheme(
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component,
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{
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container: document.body,
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...options,
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},
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theme,
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)
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if (transform) await transform(node)
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expect(node.asFragment()).toMatchSnapshot()
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// Unmounting to don't see the warning message described above
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node.unmount()
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global.console = console
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}
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}

‎packages/jest-helpers/src/index.ts‎

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import { CreateSerializerOptions, createSerializer } from '@emotion/jest'
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import { FC } from 'react'
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import makeRenderWithTheme, { RenderWithThemeFn } from './helpers/renderWithTheme'
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import makeShouldMatchEmotionSnapshot, { ShouldMatchEmotionSnapshotFn } from './helpers/shouldMatchEmotionSnapshot'
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import makeShouldMatchEmotionSnapshotWithPortal, { ShouldMatchEmotionSnapshotWithPortalFn } from './helpers/shouldMatchEmotionSnapshotWithPortal'
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export { default as makeRenderWithTheme } from './helpers/renderWithTheme'
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type Helpers<Theme> = {
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renderWithTheme: RenderWithThemeFn<Theme>
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shouldMatchEmotionSnapshot: ShouldMatchEmotionSnapshotFn<Theme>
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shouldMatchEmotionSnapshotWithPortal: ShouldMatchEmotionSnapshotWithPortalFn<Theme>
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}
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export default function makeHelpers<Theme>(Wrapper: FC<{ theme?: Theme }>, createSerializerOptions?: CreateSerializerOptions): Helpers<Theme> {
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expect.addSnapshotSerializer(
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createSerializer(createSerializerOptions),
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)
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const renderWithTheme = makeRenderWithTheme(Wrapper)
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const shouldMatchEmotionSnapshot = makeShouldMatchEmotionSnapshot(renderWithTheme)
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const shouldMatchEmotionSnapshotWithPortal = makeShouldMatchEmotionSnapshotWithPortal(renderWithTheme)
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return {
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renderWithTheme,
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shouldMatchEmotionSnapshot,
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shouldMatchEmotionSnapshotWithPortal,
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}
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}

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