Testing

Testing with Mocha, Chai, Enjyme and Sinon

Mocha

Mocha is a javascript test framework which supports asynchronous testing, test coverage reports and use of any assertion library.

Chai

Chai is a BDD/TDD assertion library

Enzyme

Enjyme is a javascript testing utility for React that makes it easier to traverse and manipulate react component's output

Sinon

Sinon is used for Spies/Stubs/Mocks. It can also fake ajax calls and timers. So basically it allows you solve problems which occur due to external dependencies.

Spies - offers information about function cals
Stubs - Which are like spies but completely replace the functions
Mocks - It replaces the whole object by combining spies and stubs

Adding Mocha, Chai, Enjyme and Sinon to the project

yarn add --dev chai
yarn add --dev enzyme
yarn add --dev enzyme-adapter-react-16
yarn add --dev mocha
yarn add --dev @types/chai
yarn add --dev @types/enzyme
yarn add --dev @types/enzyme-adapter-react-16
yarn add --dev @types/mocha
yarn add --dev chai enzyme enzyme-adapter-react-16 mocha
yarn add --dev @types/chai @types/enzyme @types/enzyme-adapter-react-16 @types/mocha
```<style>
  .scroll-to-top {
    font-size: 2.5rem;
    width: 3.2rem;
    height: 3.2rem;
    display: none;
    align-items: center;
    justify-content: center;
    position: fixed;
    padding: 0.75rem;
    bottom: 4rem;
    right: calc(1.25rem + 90px + var(--page-padding));
    z-index: 999;
    cursor: pointer;
    border: none;
    color: var(--bg);
    background: var(--fg);
    border-radius: 50%;
  }
  .scroll-to-top.hidden {
    display: none;
  }
  .scroll-to-top i {
    transform: translateY(-2px);
  }
  @media (min-width: 1080px) {
    .scroll-to-top {
      display: flex;
    }
  }
</style>
<button type="button" aria-label="scroll-to-top" class="scroll-to-top hidden" onclick="scrollToTop()">
  <i class="fa fa-angle-up"></i>
</button>
<script>
  const scrollToTop = () => window.scroll({ top: 0, behavior: "smooth" });
  window.addEventListener("scroll", () => {
    const button = document.querySelector(".scroll-to-top");
    button.classList.toggle("hidden", window.scrollY < 200);
  });
</script>
<style>
  footer {
    text-align: center;
    text-wrap: balance;
    margin-top: 5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }
  footer p {
    margin: 0;
  }
</style>
<footer><p>Copyright © 2024 • Created with ❤️ by <a href="https://ashish.me">Ashish Patel</a></p>
</footer>

Wiki