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:owl: Custom jest matchers to test the state of the DOM

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Quick Overview

jest-dom is a custom Jest matcher library for testing DOM elements. It extends Jest's built-in assertions with additional, DOM-specific matchers, making it easier to write more expressive and readable tests for web applications.

Pros

  • Provides intuitive, DOM-specific matchers for easier testing
  • Improves test readability and expressiveness
  • Integrates seamlessly with Jest and Testing Library
  • Regularly maintained and updated

Cons

  • Limited to DOM-related assertions
  • Requires additional setup and configuration
  • May have a learning curve for developers new to custom matchers
  • Potential overhead for small projects with simple DOM testing needs

Code Examples

  1. Testing if an element has specific text content:
test('element has correct text content', () => {
  const element = screen.getByTestId('greeting');
  expect(element).toHaveTextContent('Hello, World!');
});
  1. Checking if an element has a specific CSS class:
test('button has correct CSS class', () => {
  const button = screen.getByRole('button');
  expect(button).toHaveClass('primary-button');
});
  1. Verifying if an input element is disabled:
test('input is disabled', () => {
  const input = screen.getByLabelText('Username');
  expect(input).toBeDisabled();
});

Getting Started

To use jest-dom in your project:

  1. Install the package:
npm install --save-dev @testing-library/jest-dom
  1. Import the matchers in your test setup file or individual test files:
import '@testing-library/jest-dom';
  1. Use the custom matchers in your tests:
test('example test', () => {
  const element = document.createElement('div');
  element.textContent = 'Hello, World!';
  expect(element).toHaveTextContent('Hello, World!');
});

Competitor Comparisons

🐐 Simple and complete React DOM testing utilities that encourage good testing practices.

Pros of react-testing-library

  • Encourages testing user behavior rather than implementation details
  • Provides a more intuitive API for testing React components
  • Promotes accessibility-friendly testing practices

Cons of react-testing-library

  • Steeper learning curve for developers used to enzyme or other testing libraries
  • May require more setup for complex component testing scenarios
  • Less suitable for testing non-React JavaScript code

Code Comparison

react-testing-library:

import { render, fireEvent } from '@testing-library/react';

test('button click', () => {
  const { getByText } = render(<Button>Click me</Button>);
  fireEvent.click(getByText('Click me'));
});

jest-dom:

import '@testing-library/jest-dom';

test('element has class', () => {
  const element = document.createElement('div');
  element.classList.add('my-class');
  expect(element).toHaveClass('my-class');
});

Key Differences

  • react-testing-library focuses on testing React components and user interactions
  • jest-dom provides custom Jest matchers for DOM elements
  • react-testing-library is more comprehensive for React testing, while jest-dom enhances Jest assertions for DOM elements
  • jest-dom can be used alongside react-testing-library for more expressive assertions
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Pros of Jest

  • Comprehensive testing framework with built-in assertion library, mocking, and code coverage
  • Extensive ecosystem with plugins and integrations for various frameworks and tools
  • Parallel test execution for faster performance

Cons of Jest

  • Steeper learning curve due to more features and configuration options
  • Larger package size and potential for slower startup times
  • May require additional setup for certain testing scenarios

Code Comparison

jest-dom:

expect(element).toHaveTextContent('Hello, World');
expect(element).toBeVisible();
expect(element).toHaveClass('active');

Jest:

expect(element.textContent).toBe('Hello, World');
expect(element.style.display).not.toBe('none');
expect(element.classList.contains('active')).toBe(true);

Key Differences

  • jest-dom focuses on DOM-specific matchers, while Jest provides a more general-purpose testing framework
  • jest-dom offers more readable and expressive assertions for DOM elements
  • Jest includes features like test runners, mocking, and code coverage out of the box
  • jest-dom is typically used as an extension to Jest for improved DOM testing capabilities

Use Cases

  • Choose jest-dom when focusing on DOM-specific testing and want more intuitive assertions
  • Opt for Jest when building a comprehensive test suite for both DOM and non-DOM related code
  • Consider using both together for enhanced DOM testing within the Jest ecosystem
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Pros of Cypress

  • End-to-end testing framework with real browser execution
  • Rich, interactive test runner with time-travel debugging
  • Automatic waiting and retry logic for more stable tests

Cons of Cypress

  • Steeper learning curve due to its comprehensive nature
  • Limited cross-browser testing capabilities (primarily Chrome-based)
  • Can be slower for large test suites compared to unit testing

Code Comparison

Jest-dom assertion:

expect(element).toHaveTextContent('Hello, World!');

Cypress assertion:

cy.get(element).should('have.text', 'Hello, World!');

Key Differences

Jest-dom is a set of custom Jest matchers for testing DOM elements, while Cypress is a complete end-to-end testing framework. Jest-dom is typically used for unit and integration testing, focusing on individual components or small parts of the application. Cypress, on the other hand, simulates user interactions in a real browser environment, making it more suitable for full user flow testing.

Jest-dom integrates seamlessly with Jest and React Testing Library, making it a popular choice for React developers. Cypress provides a more isolated testing environment and can be used with various frontend frameworks, not just React.

While Jest-dom tests are usually faster to run, Cypress offers more realistic testing scenarios and better visual feedback during test execution. The choice between the two depends on the specific testing needs and the desired balance between speed and comprehensiveness in the testing strategy.

19,954

JavaScript Testing utilities for React

Pros of Enzyme

  • More flexible and powerful API for component manipulation
  • Allows shallow rendering for isolated unit testing
  • Supports full DOM rendering for integration tests

Cons of Enzyme

  • Steeper learning curve due to more complex API
  • Requires additional setup and configuration
  • Less focus on accessibility and user-centric testing

Code Comparison

Enzyme:

const wrapper = shallow(<MyComponent />);
expect(wrapper.find('.my-class').text()).toBe('Hello');
wrapper.find('button').simulate('click');
expect(wrapper.state('clicked')).toBe(true);

Jest-DOM:

render(<MyComponent />);
expect(screen.getByText('Hello')).toBeInTheDocument();
fireEvent.click(screen.getByRole('button'));
expect(screen.getByTestId('result')).toHaveTextContent('Clicked');

Key Differences

  • Enzyme focuses on component internals and implementation details
  • Jest-DOM emphasizes testing from a user's perspective
  • Enzyme provides more methods for traversing and manipulating components
  • Jest-DOM encourages writing more accessible and maintainable tests

Conclusion

While Enzyme offers more flexibility and power for testing React components, Jest-DOM provides a simpler, more user-centric approach. The choice between the two depends on specific project needs and testing philosophy.

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JavaScript API for Chrome and Firefox

Pros of Puppeteer

  • Provides full browser automation, allowing for end-to-end testing and complex user interactions
  • Supports screenshot capture and PDF generation, useful for visual regression testing
  • Offers a powerful API for scraping and automating web applications

Cons of Puppeteer

  • Heavier and slower to set up compared to jest-dom's lightweight approach
  • Requires more resources and may be overkill for simple DOM testing scenarios
  • Steeper learning curve due to its extensive API and capabilities

Code Comparison

jest-dom example:

expect(element).toHaveTextContent('Hello, World!');
expect(element).toBeVisible();
expect(element).toHaveClass('active');

Puppeteer example:

await page.goto('https://example.com');
await page.type('#username', 'user123');
await page.click('#submit-button');
await page.screenshot({ path: 'screenshot.png' });

Key Differences

  • jest-dom focuses on DOM element assertions, while Puppeteer provides full browser control
  • jest-dom is designed for unit and integration testing, whereas Puppeteer excels in end-to-end testing
  • Puppeteer allows for interaction with real browser environments, while jest-dom works with JSDOM

Use Cases

  • Use jest-dom for lightweight DOM testing in React applications
  • Choose Puppeteer for complex web scraping, automation, or end-to-end testing scenarios
22,590

☕️ simple, flexible, fun javascript test framework for node.js & the browser

Pros of Mocha

  • More flexible and framework-agnostic, allowing use with various assertion libraries
  • Supports both synchronous and asynchronous testing
  • Extensive plugin ecosystem for additional functionality

Cons of Mocha

  • Requires additional setup and configuration for DOM testing
  • Less intuitive for React-specific testing scenarios
  • May need extra libraries for more advanced assertions

Code Comparison

Mocha:

describe('Array', function() {
  describe('#indexOf()', function() {
    it('should return -1 when the value is not present', function() {
      assert.equal([1, 2, 3].indexOf(4), -1);
    });
  });
});

Jest-dom:

test('renders welcome message', () => {
  render(<App />);
  const welcomeElement = screen.getByText(/Welcome to React/i);
  expect(welcomeElement).toBeInTheDocument();
});

Jest-dom is specifically designed for testing DOM elements in React applications, providing custom matchers that make assertions more readable and intuitive. Mocha, on the other hand, is a more general-purpose testing framework that can be used for various types of JavaScript testing, including server-side and browser-based applications. While Mocha offers greater flexibility, Jest-dom simplifies DOM-specific testing in React environments.

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README

jest-dom

owl

Custom jest matchers to test the state of the DOM


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The problem

You want to use jest to write tests that assert various things about the state of a DOM. As part of that goal, you want to avoid all the repetitive patterns that arise in doing so. Checking for an element's attributes, its text content, its css classes, you name it.

This solution

The @testing-library/jest-dom library provides a set of custom jest matchers that you can use to extend jest. These will make your tests more declarative, clear to read and to maintain.

Table of Contents

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/jest-dom

or

for installation with yarn package manager.

yarn add --dev @testing-library/jest-dom

Note: We also recommend installing the jest-dom eslint plugin which provides auto-fixable lint rules that prevent false positive tests and improve test readability by ensuring you are using the right matchers in your tests. More details can be found at eslint-plugin-jest-dom.

Usage

Import @testing-library/jest-dom once (for instance in your tests setup file) and you're good to go:

// In your own jest-setup.js (or any other name)
import '@testing-library/jest-dom'

// In jest.config.js add (if you haven't already)
setupFilesAfterEnv: ['<rootDir>/jest-setup.js']

With @jest/globals

If you are using @jest/globals with injectGlobals: false, you will need to use a different import in your tests setup file:

// In your own jest-setup.js (or any other name)
import '@testing-library/jest-dom/jest-globals'

With Vitest

If you are using vitest, this module will work as-is, but you will need to use a different import in your tests setup file. This file should be added to the setupFiles property in your vitest config:

// In your own vitest-setup.js (or any other name)
import '@testing-library/jest-dom/vitest'

// In vitest.config.js add (if you haven't already)
setupFiles: ['./vitest-setup.js']

Also, depending on your local setup, you may need to update your tsconfig.json:

  // In tsconfig.json
  "compilerOptions": {
    ...
    "types": ["vitest/globals", "@testing-library/jest-dom"]
  },
  "include": [
    ...
    "./vitest.setup.ts"
  ],

With TypeScript

If you're using TypeScript, make sure your setup file is a .ts and not a .js to include the necessary types.

You will also need to include your setup file in your tsconfig.json if you haven't already:

  // In tsconfig.json
  "include": [
    ...
    "./jest-setup.ts"
  ],

With another Jest-compatible expect

If you are using a different test runner that is compatible with Jest's expect interface, it might be possible to use it with this library:

import * as matchers from '@testing-library/jest-dom/matchers'
import {expect} from 'my-test-runner/expect'

expect.extend(matchers)

Custom matchers

@testing-library/jest-dom can work with any library or framework that returns DOM elements from queries. The custom matcher examples below are written using matchers from @testing-library's suite of libraries (e.g. getByTestId, queryByTestId, getByText, etc.)

toBeDisabled

toBeDisabled()

This allows you to check whether an element is disabled from the user's perspective. According to the specification, the following elements can be disabled: button, input, select, textarea, optgroup, option, fieldset, and custom elements.

This custom matcher considers an element as disabled if the element is among the types of elements that can be disabled (listed above), and the disabled attribute is present. It will also consider the element as disabled if it's inside a parent form element that supports being disabled and has the disabled attribute present.

Examples

<button data-testid="button" type="submit" disabled>submit</button>
<fieldset disabled><input type="text" data-testid="input" /></fieldset>
<a href="..." disabled>link</a>
expect(getByTestId('button')).toBeDisabled()
expect(getByTestId('input')).toBeDisabled()
expect(getByText('link')).not.toBeDisabled()

This custom matcher does not take into account the presence or absence of the aria-disabled attribute. For more on why this is the case, check #144.


toBeEnabled

toBeEnabled()

This allows you to check whether an element is not disabled from the user's perspective.

It works like not.toBeDisabled(). Use this matcher to avoid double negation in your tests.

This custom matcher does not take into account the presence or absence of the aria-disabled attribute. For more on why this is the case, check #144.


toBeEmptyDOMElement

toBeEmptyDOMElement()

This allows you to assert whether an element has no visible content for the user. It ignores comments but will fail if the element contains white-space.

Examples

<span data-testid="not-empty"><span data-testid="empty"></span></span>
<span data-testid="with-whitespace"> </span>
<span data-testid="with-comment"><!-- comment --></span>
expect(getByTestId('empty')).toBeEmptyDOMElement()
expect(getByTestId('not-empty')).not.toBeEmptyDOMElement()
expect(getByTestId('with-whitespace')).not.toBeEmptyDOMElement()

toBeInTheDocument

toBeInTheDocument()

This allows you to assert whether an element is present in the document or not.

Examples

<span data-testid="html-element"><span>Html Element</span></span>
<svg data-testid="svg-element"></svg>
expect(
  getByTestId(document.documentElement, 'html-element'),
).toBeInTheDocument()
expect(getByTestId(document.documentElement, 'svg-element')).toBeInTheDocument()
expect(
  queryByTestId(document.documentElement, 'does-not-exist'),
).not.toBeInTheDocument()

Note: This matcher does not find detached elements. The element must be added to the document to be found by toBeInTheDocument. If you desire to search in a detached element please use: toContainElement


toBeInvalid

toBeInvalid()

This allows you to check if an element, is currently invalid.

An element is invalid if it has an aria-invalid attribute with no value or a value of "true", or if the result of checkValidity() is false.

Examples

<input data-testid="no-aria-invalid" />
<input data-testid="aria-invalid" aria-invalid />
<input data-testid="aria-invalid-value" aria-invalid="true" />
<input data-testid="aria-invalid-false" aria-invalid="false" />

<form data-testid="valid-form">
  <input />
</form>

<form data-testid="invalid-form">
  <input required />
</form>
expect(getByTestId('no-aria-invalid')).not.toBeInvalid()
expect(getByTestId('aria-invalid')).toBeInvalid()
expect(getByTestId('aria-invalid-value')).toBeInvalid()
expect(getByTestId('aria-invalid-false')).not.toBeInvalid()

expect(getByTestId('valid-form')).not.toBeInvalid()
expect(getByTestId('invalid-form')).toBeInvalid()

toBeRequired

toBeRequired()

This allows you to check if a form element is currently required.

An element is required if it is having a required or aria-required="true" attribute.

Examples

<input data-testid="required-input" required />
<input data-testid="aria-required-input" aria-required="true" />
<input data-testid="conflicted-input" required aria-required="false" />
<input data-testid="aria-not-required-input" aria-required="false" />
<input data-testid="optional-input" />
<input data-testid="unsupported-type" type="image" required />
<select data-testid="select" required></select>
<textarea data-testid="textarea" required></textarea>
<div data-testid="supported-role" role="tree" required></div>
<div data-testid="supported-role-aria" role="tree" aria-required="true"></div>
expect(getByTestId('required-input')).toBeRequired()
expect(getByTestId('aria-required-input')).toBeRequired()
expect(getByTestId('conflicted-input')).toBeRequired()
expect(getByTestId('aria-not-required-input')).not.toBeRequired()
expect(getByTestId('optional-input')).not.toBeRequired()
expect(getByTestId('unsupported-type')).not.toBeRequired()
expect(getByTestId('select')).toBeRequired()
expect(getByTestId('textarea')).toBeRequired()
expect(getByTestId('supported-role')).not.toBeRequired()
expect(getByTestId('supported-role-aria')).toBeRequired()

toBeValid

toBeValid()

This allows you to check if the value of an element, is currently valid.

An element is valid if it has no aria-invalid attributes or an attribute value of "false". The result of checkValidity() must also be true if it's a form element.

Examples

<input data-testid="no-aria-invalid" />
<input data-testid="aria-invalid" aria-invalid />
<input data-testid="aria-invalid-value" aria-invalid="true" />
<input data-testid="aria-invalid-false" aria-invalid="false" />

<form data-testid="valid-form">
  <input />
</form>

<form data-testid="invalid-form">
  <input required />
</form>
expect(getByTestId('no-aria-invalid')).toBeValid()
expect(getByTestId('aria-invalid')).not.toBeValid()
expect(getByTestId('aria-invalid-value')).not.toBeValid()
expect(getByTestId('aria-invalid-false')).toBeValid()

expect(getByTestId('valid-form')).toBeValid()
expect(getByTestId('invalid-form')).not.toBeValid()

toBeVisible

toBeVisible()

This allows you to check if an element is currently visible to the user.

An element is visible if all the following conditions are met:

  • it is present in the document
  • it does not have its css property display set to none
  • it does not have its css property visibility set to either hidden or collapse
  • it does not have its css property opacity set to 0
  • its parent element is also visible (and so on up to the top of the DOM tree)
  • it does not have the hidden attribute
  • if <details /> it has the open attribute

Examples

<div data-testid="zero-opacity" style="opacity: 0">Zero Opacity Example</div>
<div data-testid="visibility-hidden" style="visibility: hidden">
  Visibility Hidden Example
</div>
<div data-testid="display-none" style="display: none">Display None Example</div>
<div style="opacity: 0">
  <span data-testid="hidden-parent">Hidden Parent Example</span>
</div>
<div data-testid="visible">Visible Example</div>
<div data-testid="hidden-attribute" hidden>Hidden Attribute Example</div>
<details>
  <summary>Title of hidden text</summary>
  Hidden Details Example
</details>
<details open>
  <summary>Title of visible text</summary>
  <div>Visible Details Example</div>
</details>
expect(getByText('Zero Opacity Example')).not.toBeVisible()
expect(getByText('Visibility Hidden Example')).not.toBeVisible()
expect(getByText('Display None Example')).not.toBeVisible()
expect(getByText('Hidden Parent Example')).not.toBeVisible()
expect(getByText('Visible Example')).toBeVisible()
expect(getByText('Hidden Attribute Example')).not.toBeVisible()
expect(getByText('Hidden Details Example')).not.toBeVisible()
expect(getByText('Visible Details Example')).toBeVisible()

toContainElement

toContainElement(element: HTMLElement | SVGElement | null)

This allows you to assert whether an element contains another element as a descendant or not.

Examples

<span data-testid="ancestor"><span data-testid="descendant"></span></span>
const ancestor = getByTestId('ancestor')
const descendant = getByTestId('descendant')
const nonExistantElement = getByTestId('does-not-exist')

expect(ancestor).toContainElement(descendant)
expect(descendant).not.toContainElement(ancestor)
expect(ancestor).not.toContainElement(nonExistantElement)

toContainHTML

toContainHTML(htmlText: string)

Assert whether a string representing a HTML element is contained in another element. The string should contain valid html, and not any incomplete html.

Examples

<span data-testid="parent"><span data-testid="child"></span></span>
// These are valid uses
expect(getByTestId('parent')).toContainHTML('<span data-testid="child"></span>')
expect(getByTestId('parent')).toContainHTML('<span data-testid="child" />')
expect(getByTestId('parent')).not.toContainHTML('<br />')

// These won't work
expect(getByTestId('parent')).toContainHTML('data-testid="child"')
expect(getByTestId('parent')).toContainHTML('data-testid')
expect(getByTestId('parent')).toContainHTML('</span>')

Chances are you probably do not need to use this matcher. We encourage testing from the perspective of how the user perceives the app in a browser. That's why testing against a specific DOM structure is not advised.

It could be useful in situations where the code being tested renders html that was obtained from an external source, and you want to validate that that html code was used as intended.

It should not be used to check DOM structure that you control. Please use toContainElement instead.


toHaveAccessibleDescription

toHaveAccessibleDescription(expectedAccessibleDescription?: string | RegExp)

This allows you to assert that an element has the expected accessible description.

You can pass the exact string of the expected accessible description, or you can make a partial match passing a regular expression, or by using expect.stringContaining/expect.stringMatching.

Examples

<a
  data-testid="link"
  href="/"
  aria-label="Home page"
  title="A link to start over"
  >Start</a
>
<a data-testid="extra-link" href="/about" aria-label="About page">About</a>
<img src="avatar.jpg" data-testid="avatar" alt="User profile pic" />
<img
  src="logo.jpg"
  data-testid="logo"
  alt="Company logo"
  aria-describedby="t1"
/>
<span id="t1" role="presentation">The logo of Our Company</span>
<img
  src="logo.jpg"
  data-testid="logo2"
  alt="Company logo"
  aria-description="The logo of Our Company"
/>
expect(getByTestId('link')).toHaveAccessibleDescription()
expect(getByTestId('link')).toHaveAccessibleDescription('A link to start over')
expect(getByTestId('link')).not.toHaveAccessibleDescription('Home page')
expect(getByTestId('extra-link')).not.toHaveAccessibleDescription()
expect(getByTestId('avatar')).not.toHaveAccessibleDescription()
expect(getByTestId('logo')).not.toHaveAccessibleDescription('Company logo')
expect(getByTestId('logo')).toHaveAccessibleDescription(
  'The logo of Our Company',
)
expect(getByTestId('logo2')).toHaveAccessibleDescription(
  'The logo of Our Company',
)

toHaveAccessibleErrorMessage

toHaveAccessibleErrorMessage(expectedAccessibleErrorMessage?: string | RegExp)

This allows you to assert that an element has the expected accessible error message.

You can pass the exact string of the expected accessible error message. Alternatively, you can perform a partial match by passing a regular expression or by using expect.stringContaining/expect.stringMatching.

Examples

<input
  aria-label="Has Error"
  aria-invalid="true"
  aria-errormessage="error-message"
/>
<div id="error-message" role="alert">This field is invalid</div>

<input aria-label="No Error Attributes" />
<input
  aria-label="Not Invalid"
  aria-invalid="false"
  aria-errormessage="error-message"
/>
// Inputs with Valid Error Messages
expect(getByRole('textbox', {name: 'Has Error'})).toHaveAccessibleErrorMessage()
expect(getByRole('textbox', {name: 'Has Error'})).toHaveAccessibleErrorMessage(
  'This field is invalid',
)
expect(getByRole('textbox', {name: 'Has Error'})).toHaveAccessibleErrorMessage(
  /invalid/i,
)
expect(
  getByRole('textbox', {name: 'Has Error'}),
).not.toHaveAccessibleErrorMessage('This field is absolutely correct!')

// Inputs without Valid Error Messages
expect(
  getByRole('textbox', {name: 'No Error Attributes'}),
).not.toHaveAccessibleErrorMessage()

expect(
  getByRole('textbox', {name: 'Not Invalid'}),
).not.toHaveAccessibleErrorMessage()

toHaveAccessibleName

toHaveAccessibleName(expectedAccessibleName?: string | RegExp)

This allows you to assert that an element has the expected accessible name. It is useful, for instance, to assert that form elements and buttons are properly labelled.

You can pass the exact string of the expected accessible name, or you can make a partial match passing a regular expression, or by using expect.stringContaining/expect.stringMatching.

Examples

<img data-testid="img-alt" src="" alt="Test alt" />
<img data-testid="img-empty-alt" src="" alt="" />
<svg data-testid="svg-title"><title>Test title</title></svg>
<button data-testid="button-img-alt"><img src="" alt="Test" /></button>
<p><img data-testid="img-paragraph" src="" alt="" /> Test content</p>
<button data-testid="svg-button"><svg><title>Test</title></svg></p>
<div><svg data-testid="svg-without-title"></svg></div>
<input data-testid="input-title" title="test" />
expect(getByTestId('img-alt')).toHaveAccessibleName('Test alt')
expect(getByTestId('img-empty-alt')).not.toHaveAccessibleName()
expect(getByTestId('svg-title')).toHaveAccessibleName('Test title')
expect(getByTestId('button-img-alt')).toHaveAccessibleName()
expect(getByTestId('img-paragraph')).not.toHaveAccessibleName()
expect(getByTestId('svg-button')).toHaveAccessibleName()
expect(getByTestId('svg-without-title')).not.toHaveAccessibleName()
expect(getByTestId('input-title')).toHaveAccessibleName()

toHaveAttribute

toHaveAttribute(attr: string, value?: any)

This allows you to check whether the given element has an attribute or not. You can also optionally check that the attribute has a specific expected value or partial match using expect.stringContaining/expect.stringMatching

Examples

<button data-testid="ok-button" type="submit" disabled>ok</button>
const button = getByTestId('ok-button')

expect(button).toHaveAttribute('disabled')
expect(button).toHaveAttribute('type', 'submit')
expect(button).not.toHaveAttribute('type', 'button')

expect(button).toHaveAttribute('type', expect.stringContaining('sub'))
expect(button).toHaveAttribute('type', expect.not.stringContaining('but'))

toHaveClass

toHaveClass(...classNames: string[], options?: {exact: boolean})

This allows you to check whether the given element has certain classes within its class attribute. You must provide at least one class, unless you are asserting that an element does not have any classes.

The list of class names may include strings and regular expressions. Regular expressions are matched against each individual class in the target element, and it is NOT matched against its full class attribute value as whole.

Examples

<button data-testid="delete-button" class="btn extra btn-danger">
  Delete item
</button>
<button data-testid="no-classes">No Classes</button>
const deleteButton = getByTestId('delete-button')
const noClasses = getByTestId('no-classes')

expect(deleteButton).toHaveClass('extra')
expect(deleteButton).toHaveClass('btn-danger btn')
expect(deleteButton).toHaveClass(/danger/, 'btn')
expect(deleteButton).toHaveClass('btn-danger', 'btn')
expect(deleteButton).not.toHaveClass('btn-link')
expect(deleteButton).not.toHaveClass(/link/)
expect(deleteButton).not.toHaveClass(/btn extra/) // It does not match

expect(deleteButton).toHaveClass('btn-danger extra btn', {exact: true}) // to check if the element has EXACTLY a set of classes
expect(deleteButton).not.toHaveClass('btn-danger extra', {exact: true}) // if it has more than expected it is going to fail

expect(noClasses).not.toHaveClass()

toHaveFocus

toHaveFocus()

This allows you to assert whether an element has focus or not.

Examples

<div><input type="text" data-testid="element-to-focus" /></div>
const input = getByTestId('element-to-focus')

input.focus()
expect(input).toHaveFocus()

input.blur()
expect(input).not.toHaveFocus()

toHaveFormValues

toHaveFormValues(expectedValues: {
  [name: string]: any
})

This allows you to check if a form or fieldset contains form controls for each given name, and having the specified value.

It is important to stress that this matcher can only be invoked on a form or a fieldset element.

This allows it to take advantage of the .elements property in form and fieldset to reliably fetch all form controls within them.

This also avoids the possibility that users provide a container that contains more than one form, thereby intermixing form controls that are not related, and could even conflict with one another.

This matcher abstracts away the particularities with which a form control value is obtained depending on the type of form control. For instance, <input> elements have a value attribute, but <select> elements do not. Here's a list of all cases covered:

  • <input type="number"> elements return the value as a number, instead of a string.
  • <input type="checkbox"> elements:
    • if there's a single one with the given name attribute, it is treated as a boolean, returning true if the checkbox is checked, false if unchecked.
    • if there's more than one checkbox with the same name attribute, they are all treated collectively as a single form control, which returns the value as an array containing all the values of the selected checkboxes in the collection.
  • <input type="radio"> elements are all grouped by the name attribute, and such a group treated as a single form control. This form control returns the value as a string corresponding to the value attribute of the selected radio button within the group.
  • <input type="text"> elements return the value as a string. This also applies to <input> elements having any other possible type attribute that's not explicitly covered in different rules above (e.g. search, email, date, password, hidden, etc.)
  • <select> elements without the multiple attribute return the value as a string corresponding to the value attribute of the selected option, or undefined if there's no selected option.
  • <select multiple> elements return the value as an array containing all the values of the selected options.
  • <textarea> elements return their value as a string. The value corresponds to their node content.

The above rules make it easy, for instance, to switch from using a single select control to using a group of radio buttons. Or to switch from a multi select control, to using a group of checkboxes. The resulting set of form values used by this matcher to compare against would be the same.

Examples

<form data-testid="login-form">
  <input type="text" name="username" value="jane.doe" />
  <input type="password" name="password" value="12345678" />
  <input type="checkbox" name="rememberMe" checked />
  <button type="submit">Sign in</button>
</form>
expect(getByTestId('login-form')).toHaveFormValues({
  username: 'jane.doe',
  rememberMe: true,
})

toHaveStyle

toHaveStyle(css: string | object)

This allows you to check if a certain element has some specific css properties with specific values applied. It matches only if the element has all the expected properties applied, not just some of them.

Examples

<button
  data-testid="delete-button"
  style="display: none; background-color: red"
>
  Delete item
</button>
const button = getByTestId('delete-button')

expect(button).toHaveStyle('display: none')
expect(button).toHaveStyle({display: 'none'})
expect(button).toHaveStyle(`
  background-color: red;
  display: none;
`)
expect(button).toHaveStyle({
  backgroundColor: 'red',
  display: 'none',
})
expect(button).not.toHaveStyle(`
  background-color: blue;
  display: none;
`)
expect(button).not.toHaveStyle({
  backgroundColor: 'blue',
  display: 'none',
})

This also works with rules that are applied to the element via a class name for which some rules are defined in a stylesheet currently active in the document. The usual rules of css precedence apply.


toHaveTextContent

toHaveTextContent(text: string | RegExp, options?: {normalizeWhitespace: boolean})

This allows you to check whether the given node has a text content or not. This supports elements, but also text nodes and fragments.

When a string argument is passed through, it will perform a partial case-sensitive match to the node content.

To perform a case-insensitive match, you can use a RegExp with the /i modifier.

If you want to match the whole content, you can use a RegExp to do it.

Examples

<span data-testid="text-content">Text Content</span>
const element = getByTestId('text-content')

expect(element).toHaveTextContent('Content')
expect(element).toHaveTextContent(/^Text Content$/) // to match the whole content
expect(element).toHaveTextContent(/content$/i) // to use case-insensitive match
expect(element).not.toHaveTextContent('content')

toHaveValue

toHaveValue(value: string | string[] | number)

This allows you to check whether the given form element has the specified value. It accepts <input>, <select> and <textarea> elements with the exception of <input type="checkbox"> and <input type="radio">, which can be meaningfully matched only using toBeChecked or toHaveFormValues.

It also accepts elements with roles meter, progressbar, slider or spinbutton and checks their aria-valuenow attribute (as a number).

For all other form elements, the value is matched using the same algorithm as in toHaveFormValues does.

Examples

<input type="text" value="text" data-testid="input-text" />
<input type="number" value="5" data-testid="input-number" />
<input type="text" data-testid="input-empty" />
<select multiple data-testid="select-number">
  <option value="first">First Value</option>
  <option value="second" selected>Second Value</option>
  <option value="third" selected>Third Value</option>
</select>
Using DOM Testing Library
const textInput = getByTestId('input-text')
const numberInput = getByTestId('input-number')
const emptyInput = getByTestId('input-empty')
const selectInput = getByTestId('select-number')

expect(textInput).toHaveValue('text')
expect(numberInput).toHaveValue(5)
expect(emptyInput).not.toHaveValue()
expect(selectInput).toHaveValue(['second', 'third'])

toHaveDisplayValue

toHaveDisplayValue(value: string | RegExp | (string|RegExp)[])

This allows you to check whether the given form element has the specified displayed value (the one the end user will see). It accepts <input>, <select> and <textarea> elements with the exception of <input type="checkbox"> and <input type="radio">, which can be meaningfully matched only using toBeChecked or toHaveFormValues.

Examples

<label for="input-example">First name</label>
<input type="text" id="input-example" value="Luca" />

<label for="textarea-example">Description</label>
<textarea id="textarea-example">An example description here.</textarea>

<label for="single-select-example">Fruit</label>
<select id="single-select-example">
  <option value="">Select a fruit...</option>
  <option value="banana">Banana</option>
  <option value="ananas">Ananas</option>
  <option value="avocado">Avocado</option>
</select>

<label for="multiple-select-example">Fruits</label>
<select id="multiple-select-example" multiple>
  <option value="">Select a fruit...</option>
  <option value="banana" selected>Banana</option>
  <option value="ananas">Ananas</option>
  <option value="avocado" selected>Avocado</option>
</select>
Using DOM Testing Library
const input = screen.getByLabelText('First name')
const textarea = screen.getByLabelText('Description')
const selectSingle = screen.getByLabelText('Fruit')
const selectMultiple = screen.getByLabelText('Fruits')

expect(input).toHaveDisplayValue('Luca')
expect(input).toHaveDisplayValue(/Luc/)
expect(textarea).toHaveDisplayValue('An example description here.')
expect(textarea).toHaveDisplayValue(/example/)
expect(selectSingle).toHaveDisplayValue('Select a fruit...')
expect(selectSingle).toHaveDisplayValue(/Select/)
expect(selectMultiple).toHaveDisplayValue([/Avocado/, 'Banana'])

toBeChecked

toBeChecked()

This allows you to check whether the given element is checked. It accepts an input of type checkbox or radio and elements with a role of checkbox, radio or switch with a valid aria-checked attribute of "true" or "false".

Examples

<input type="checkbox" checked data-testid="input-checkbox-checked" />
<input type="checkbox" data-testid="input-checkbox-unchecked" />
<div role="checkbox" aria-checked="true" data-testid="aria-checkbox-checked" />
<div
  role="checkbox"
  aria-checked="false"
  data-testid="aria-checkbox-unchecked"
/>

<input type="radio" checked value="foo" data-testid="input-radio-checked" />
<input type="radio" value="foo" data-testid="input-radio-unchecked" />
<div role="radio" aria-checked="true" data-testid="aria-radio-checked" />
<div role="radio" aria-checked="false" data-testid="aria-radio-unchecked" />
<div role="switch" aria-checked="true" data-testid="aria-switch-checked" />
<div role="switch" aria-checked="false" data-testid="aria-switch-unchecked" />
const inputCheckboxChecked = getByTestId('input-checkbox-checked')
const inputCheckboxUnchecked = getByTestId('input-checkbox-unchecked')
const ariaCheckboxChecked = getByTestId('aria-checkbox-checked')
const ariaCheckboxUnchecked = getByTestId('aria-checkbox-unchecked')
expect(inputCheckboxChecked).toBeChecked()
expect(inputCheckboxUnchecked).not.toBeChecked()
expect(ariaCheckboxChecked).toBeChecked()
expect(ariaCheckboxUnchecked).not.toBeChecked()

const inputRadioChecked = getByTestId('input-radio-checked')
const inputRadioUnchecked = getByTestId('input-radio-unchecked')
const ariaRadioChecked = getByTestId('aria-radio-checked')
const ariaRadioUnchecked = getByTestId('aria-radio-unchecked')
expect(inputRadioChecked).toBeChecked()
expect(inputRadioUnchecked).not.toBeChecked()
expect(ariaRadioChecked).toBeChecked()
expect(ariaRadioUnchecked).not.toBeChecked()

const ariaSwitchChecked = getByTestId('aria-switch-checked')
const ariaSwitchUnchecked = getByTestId('aria-switch-unchecked')
expect(ariaSwitchChecked).toBeChecked()
expect(ariaSwitchUnchecked).not.toBeChecked()

toBePartiallyChecked

toBePartiallyChecked()

This allows you to check whether the given element is partially checked. It accepts an input of type checkbox and elements with a role of checkbox with a aria-checked="mixed", or input of type checkbox with indeterminate set to true

Examples

<input type="checkbox" aria-checked="mixed" data-testid="aria-checkbox-mixed" />
<input type="checkbox" checked data-testid="input-checkbox-checked" />
<input type="checkbox" data-testid="input-checkbox-unchecked" />
<div role="checkbox" aria-checked="true" data-testid="aria-checkbox-checked" />
<div
  role="checkbox"
  aria-checked="false"
  data-testid="aria-checkbox-unchecked"
/>
<input type="checkbox" data-testid="input-checkbox-indeterminate" />
const ariaCheckboxMixed = getByTestId('aria-checkbox-mixed')
const inputCheckboxChecked = getByTestId('input-checkbox-checked')
const inputCheckboxUnchecked = getByTestId('input-checkbox-unchecked')
const ariaCheckboxChecked = getByTestId('aria-checkbox-checked')
const ariaCheckboxUnchecked = getByTestId('aria-checkbox-unchecked')
const inputCheckboxIndeterminate = getByTestId('input-checkbox-indeterminate')

expect(ariaCheckboxMixed).toBePartiallyChecked()
expect(inputCheckboxChecked).not.toBePartiallyChecked()
expect(inputCheckboxUnchecked).not.toBePartiallyChecked()
expect(ariaCheckboxChecked).not.toBePartiallyChecked()
expect(ariaCheckboxUnchecked).not.toBePartiallyChecked()

inputCheckboxIndeterminate.indeterminate = true
expect(inputCheckboxIndeterminate).toBePartiallyChecked()

toHaveRole

This allows you to assert that an element has the expected role.

This is useful in cases where you already have access to an element via some query other than the role itself, and want to make additional assertions regarding its accessibility.

The role can match either an explicit role (via the role attribute), or an implicit one via the implicit ARIA semantics.

Note: roles are matched literally by string equality, without inheriting from the ARIA role hierarchy. As a result, querying a superclass role like 'checkbox' will not include elements with a subclass role like 'switch'.

toHaveRole(expectedRole: string)
<button data-testid="button">Continue</button>
<div role="button" data-testid="button-explicit">Continue</button>
<button role="switch button" data-testid="button-explicit-multiple">Continue</button>
<a href="/about" data-testid="link">About</a>
<a data-testid="link-invalid">Invalid link<a/>
expect(getByTestId('button')).toHaveRole('button')
expect(getByTestId('button-explicit')).toHaveRole('button')
expect(getByTestId('button-explicit-multiple')).toHaveRole('button')
expect(getByTestId('button-explicit-multiple')).toHaveRole('switch')
expect(getByTestId('link')).toHaveRole('link')
expect(getByTestId('link-invalid')).not.toHaveRole('link')
expect(getByTestId('link-invalid')).toHaveRole('generic')

toHaveErrorMessage

This custom matcher is deprecated. Prefer toHaveAccessibleErrorMessage instead, which is more comprehensive in implementing the official spec.

toHaveErrorMessage(text: string | RegExp)

This allows you to check whether the given element has an ARIA error message or not.

Use the aria-errormessage attribute to reference another element that contains custom error message text. Multiple ids is NOT allowed. Authors MUST use aria-invalid in conjunction with aria-errormessage. Learn more from aria-errormessage spec.

Whitespace is normalized.

When a string argument is passed through, it will perform a whole case-sensitive match to the error message text.

To perform a case-insensitive match, you can use a RegExp with the /i modifier.

To perform a partial match, you can pass a RegExp or use expect.stringContaining("partial string").

Examples

<label for="startTime"> Please enter a start time for the meeting: </label>
<input
  id="startTime"
  type="text"
  aria-errormessage="msgID"
  aria-invalid="true"
  value="11:30 PM"
/>
<span id="msgID" aria-live="assertive" style="visibility:visible">
  Invalid time: the time must be between 9:00 AM and 5:00 PM
</span>
const timeInput = getByLabel('startTime')

expect(timeInput).toHaveErrorMessage(
  'Invalid time: the time must be between 9:00 AM and 5:00 PM',
)
expect(timeInput).toHaveErrorMessage(/invalid time/i) // to partially match
expect(timeInput).toHaveErrorMessage(expect.stringContaining('Invalid time')) // to partially match
expect(timeInput).not.toHaveErrorMessage('Pikachu!')

Deprecated matchers

toBeEmpty

Note: This matcher is being deprecated due to a name clash with jest-extended. See more info in #216. In the future, please use only toBeEmptyDOMElement

toBeEmpty()

This allows you to assert whether an element has content or not.

Examples

<span data-testid="not-empty"><span data-testid="empty"></span></span>
expect(getByTestId('empty')).toBeEmpty()
expect(getByTestId('not-empty')).not.toBeEmpty()

toBeInTheDOM

This custom matcher is deprecated. Prefer toBeInTheDocument instead.

toBeInTheDOM()

This allows you to check whether a value is a DOM element, or not.

Contrary to what its name implies, this matcher only checks that you passed to it a valid DOM element. It does not have a clear definition of what "the DOM" is. Therefore, it does not check whether that element is contained anywhere.

This is the main reason why this matcher is deprecated, and will be removed in the next major release. You can follow the discussion around this decision in more detail here.

As an alternative, you can use toBeInTheDocument or toContainElement. Or if you just want to check if a value is indeed an HTMLElement you can always use some of jest's built-in matchers:

expect(document.querySelector('.ok-button')).toBeInstanceOf(HTMLElement)
expect(document.querySelector('.cancel-button')).toBeTruthy()

Note: The differences between toBeInTheDOM and toBeInTheDocument are significant. Replacing all uses of toBeInTheDOM with toBeInTheDocument will likely cause unintended consequences in your tests. Please make sure when replacing toBeInTheDOM to read through the documentation of the proposed alternatives to see which use case works better for your needs.


toHaveDescription

This custom matcher is deprecated. Prefer toHaveAccessibleDescription instead, which is more comprehensive in implementing the official spec.

toHaveDescription(text: string | RegExp)

This allows you to check whether the given element has a description or not.

An element gets its description via the aria-describedby attribute. Set this to the id of one or more other elements. These elements may be nested inside, be outside, or a sibling of the passed in element.

Whitespace is normalized. Using multiple ids will join the referenced elements’ text content separated by a space.

When a string argument is passed through, it will perform a whole case-sensitive match to the description text.

To perform a case-insensitive match, you can use a RegExp with the /i modifier.

To perform a partial match, you can pass a RegExp or use expect.stringContaining("partial string").

Examples

<button aria-label="Close" aria-describedby="description-close">X</button>
<div id="description-close">Closing will discard any changes</div>

<button>Delete</button>
const closeButton = getByRole('button', {name: 'Close'})

expect(closeButton).toHaveDescription('Closing will discard any changes')
expect(closeButton).toHaveDescription(/will discard/) // to partially match
expect(closeButton).toHaveDescription(expect.stringContaining('will discard')) // to partially match
expect(closeButton).toHaveDescription(/^closing/i) // to use case-insensitive match
expect(closeButton).not.toHaveDescription('Other description')

const deleteButton = getByRole('button', {name: 'Delete'})
expect(deleteButton).not.toHaveDescription()
expect(deleteButton).toHaveDescription('') // Missing or empty description always becomes a blank string

toHaveSelection

This allows to assert that an element has a text selection.

This is useful to check if text or part of the text is selected within an element. The element can be either an input of type text, a textarea, or any other element that contains text, such as a paragraph, span, div etc.

NOTE: the expected selection is a string, it does not allow to check for selection range indeces.

toHaveSelection(expectedSelection?: string)
<div>
  <input type="text" value="text selected text" data-testid="text" />
  <textarea data-testid="textarea">text selected text</textarea>
  <p data-testid="prev">prev</p>
  <p data-testid="parent">
    text <span data-testid="child">selected</span> text
  </p>
  <p data-testid="next">next</p>
</div>
getByTestId('text').setSelectionRange(5, 13)
expect(getByTestId('text')).toHaveSelection('selected')

getByTestId('textarea').setSelectionRange(0, 5)
expect('textarea').toHaveSelection('text ')

const selection = document.getSelection()
const range = document.createRange()
selection.removeAllRanges()
selection.empty()
selection.addRange(range)

// selection of child applies to the parent as well
range.selectNodeContents(getByTestId('child'))
expect(getByTestId('child')).toHaveSelection('selected')
expect(getByTestId('parent')).toHaveSelection('selected')

// selection that applies from prev all, parent text before child, and part child.
range.setStart(getByTestId('prev'), 0)
range.setEnd(getByTestId('child').childNodes[0], 3)
expect(queryByTestId('prev')).toHaveSelection('prev')
expect(queryByTestId('child')).toHaveSelection('sel')
expect(queryByTestId('parent')).toHaveSelection('text sel')
expect(queryByTestId('next')).not.toHaveSelection()

// selection that applies from part child, parent text after child and part next.
range.setStart(getByTestId('child').childNodes[0], 3)
range.setEnd(getByTestId('next').childNodes[0], 2)
expect(queryByTestId('child')).toHaveSelection('ected')
expect(queryByTestId('parent')).toHaveSelection('ected text')
expect(queryByTestId('prev')).not.toHaveSelection()
expect(queryByTestId('next')).toHaveSelection('ne')

Inspiration

This whole library was extracted out of Kent C. Dodds' DOM Testing Library, which was in turn extracted out of React Testing Library.

The intention is to make this available to be used independently of these other libraries, and also to make it more clear that these other libraries are independent from jest, and can be used with other tests runners as well.

Other Solutions

I'm not aware of any, if you are please make a pull request and add it here!

If you would like to further test the accessibility and validity of the DOM consider jest-axe. It doesn't overlap with jest-dom but can complement it for more in-depth accessibility checking (eg: validating aria attributes or ensuring unique id attributes).

Guiding Principles

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

This library follows the same guiding principles as its mother library DOM Testing Library. Go check them out for more details.

Additionally, with respect to custom DOM matchers, this library aims to maintain a minimal but useful set of them, while avoiding bloating itself with merely convenient ones that can be easily achieved with other APIs. In general, the overall criteria for what is considered a useful custom matcher to add to this library, is that doing the equivalent assertion on our own makes the test code more verbose, less clear in its intent, and/or harder to read.

Contributors

Thanks goes to these people (emoji key):

Kent C. Dodds
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Ryan Castner
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Aleksandr Elkin

🚧
Mordechai Dror
Mordechai Dror

💻
Wayne Van Son
Wayne Van Son

💻 ⚠️
Idan Entin
Idan Entin

💻 ⚠️
mibcadet
mibcadet

📖
Silviu Alexandru Avram
Silviu Alexandru Avram

💻 ⚠️
Gareth Jones
Gareth Jones

💻
Billy Janitsch
Billy Janitsch

🐛
InfiniteXyy
InfiniteXyy

💻 🐛

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

LICENSE

MIT

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