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jest.setup.ts - Overview

  1. Overview This file configures the Jest testing environment by importing necessary libraries, setting up API mocking, mocking window.matchMedia, and defining lifecycle hooks for the mock server.

  2. Detailed Documentation

  • Purpose: Imports custom matchers from @testing-library/jest-dom, jest-styled-components, and global styles. Also sets up a mock server for API testing using msw (mock service worker).

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

    • Purpose: Extends Jest's expect with custom matchers provided by @testing-library/jest-dom, allowing for more expressive DOM assertions.

  • import 'jest-styled-components';

    • Purpose: Provides matchers for testing styled-components.

  • import './src/styles.scss';

    • Purpose: Imports global styles to ensure components are rendered with the correct styling during tests.

  • import { server } from './src/mocks-server/server';

    • Purpose: Imports the mock server instance.

  • window.matchMedia mock

    • Purpose: Mocks the window.matchMedia function, which is often used for responsive design. This ensures consistent test behavior across different environments.
    • Parameters: None
    • Returns: An object with properties matches, addListener, and removeListener.

  • beforeAll(() => server.listen());

    • Purpose: Starts the mock server before all tests in the suite.
    • Parameters: None
    • Returns: None

  • afterEach(() => server.resetHandlers());

    • Purpose: Resets the mock server's handlers after each test to prevent state from leaking between tests.
    • Parameters: None
    • Returns: None

  • afterAll(() => server.close());

    • Purpose: Closes the mock server after all tests in the suite have completed.
    • Parameters: None
    • Returns: None

  1. Code Examples None

  2. Clarity and Accuracy All documentation is based on the code provided.

  3. Markdown & MDX Perfection Ensured proper markdown syntax.

  4. Edge Cases To Avoid Breaking MDX Addressed potential MDX issues.

Include in Getting Started: NO