To help you get started, we've collected the most common ways that @testing-library/preact is being used within popular public projects.

downshift-js / downshift / other / misc-tests / __tests__ / preact.js View on Github

test('getInputProps composes onChange with onInput', () => {
  const onChange = jest.fn()
  const onInput = jest.fn()
  const Input = jest.fn(props =&gt; <input>)
  const {ui} = setup({
    children({getInputProps}) {
      return (
        <div>
          <input>
        </div>
      )
    },
  })
  render(ui)
  expect(Input).toHaveBeenCalledTimes(1)
  const [[firstArg]] = Input.mock.calls
  expect(firstArg).toMatchObject({
    onInput: expect.any(Function),
  })
  expect(firstArg.onChange).toBeUndefined()
  const fakeEvent = {defaultPrevented: false, target: {value: ''}}
  firstArg.onInput(fakeEvent)
  expect(onChange).toHaveBeenCalledTimes(1)
  expect(onChange).toHaveBeenCalledWith(fakeEvent)
  expect(onInput).toHaveBeenCalledTimes(1)
  expect(onInput).toHaveBeenCalledWith(fakeEvent)
})

View more ways to use @testing-library/preact

Preact Testing Library

Simple and complete Preact DOM testing utilities that encourage good testing practices.

> Inspired completely by react-testing-library

Table of Contents

• The Problem
• The Solution
• Installation
• Docs
• Issues
  • 🐛 Bugs
  • 💡 Feature Requests
  • ❓ Questions
• Contributors
• LICENSE

The Problem

You want to write tests for your Preact components so that they avoid including implementation details, and are maintainable in the long run.

The Solution

The Preact Testing Library is a very lightweight solution for testing Preact components. It provides light utility functions on top of preact/test-utils, in a way that encourages better testing practices. Its primary guiding principle is:

> The more your tests resemble the way your software is used, the more confidence they can give you.

Installation

This module is distributed via npm which is bundled with node and should be installed as one of your project's devDependencies:

npm install --save-dev @testing-library/preact

This library has peerDependencies listings for preact >= 10.

💡 You may also be interested in installing @testing-library/jest-dom so you can use the custom jest matchers.

📝 This library supports Preact X (10.x). It takes advantage of the act test utility in preact/test-utils to enable both Preact Hook and Class components to be easily tested.

📝 If you're looking for a solution for Preact 8.x then install preact-testing-library.

Docs

See the docs over at the Testing Library website.

Issues

Looking to contribute? Look for the Good First Issue label.

🐛 Bugs

Please file an issue for bugs, missing documentation, or unexpected behavior.

See Bugs

💡 Feature Requests

Please file an issue to suggest new features. Vote on feature requests by adding a 👍. This helps maintainers prioritize what to work on.

See Feature Requests

❓ Questions

For questions related to using the library, please visit a support community instead of filing an issue on GitHub.

• Preact Slack
• Stack Overflow

Contributors

Thanks goes to these people (emoji key):

Kent C. Dodds 💻 📖 ⚠️

Ants Martian 💻 📖 ⚠️

Rahim Alwer 💻 📖 ⚠️ 🚇

This project follows the all-contributors specification. Contributions of any kind welcome!

LICENSE

MIT