Top Svelte Testing Libraries

Storybook is a popular open-source development environment for building UI components and pages in isolation.

Code Example

import React from 'react';
import { storiesOf } from '@storybook/react';
import Button from './Button';

storiesOf('Button', module)
  .add('default', () => <Button>Click me</Button>)
  .add('primary', () => <Button primary>Click me</Button>);

Pros

1. Storybook provides a comprehensive set of tools and features for building and testing UI components, making it a powerful choice for front-end development.
2. Storybook has a large and active community, with a wealth of addons and plugins available to extend its functionality.
3. Storybook is framework-agnostic, allowing it to be used with a variety of front-end technologies, including React, Vue.js, and Angular.

Cons

1. Storybook can have a steep learning curve, especially for developers who are new to the tool.
2. Integrating Storybook into an existing project can be time-consuming and may require significant setup and configuration.
3. Storybook may not be the best choice for projects that have a very small number of UI components, as the overhead of setting up and maintaining Storybook may outweigh the benefits.

nvh95/jest-preview

Jest-preview is a tool that integrates Storybook with Jest, a popular JavaScript testing framework, to provide a more seamless testing experience for UI components.

Pros

1. Jest-preview simplifies the process of writing and running tests for Storybook components, making it easier to ensure the quality of UI components.
2. Jest-preview provides a more intuitive and user-friendly interface for running tests, compared to traditional command-line testing tools.
3. Jest-preview can help to improve the overall development workflow by integrating testing more closely with the Storybook development process.

Cons

1. Jest-preview is a relatively new tool, and may not have the same level of community support and documentation as Storybook itself.
2. Integrating Jest-preview with an existing Storybook project may require some additional setup and configuration.
3. Jest-preview may not be suitable for all types of testing, and developers may still need to use other testing tools and frameworks in addition to Jest-preview.

nvh95/jest-preview is a Jest snapshot testing utility that provides a visual preview of your component's snapshots.

Code Example

// Example usage of jest-preview
import { render } from '@testing-library/react';
import { toMatchSnapshot } from 'jest-preview';

test('My component', () => {
  const { container } = render(<MyComponent />);
  expect(container).toMatchSnapshot();
});

Pros of nvh95/jest-preview

1. Visual Snapshot Previewing: jest-preview allows you to visually inspect and compare your component snapshots, making it easier to identify and debug changes.
2. Seamless Integration: The library integrates seamlessly with Jest, the popular JavaScript testing framework, making it easy to set up and use.
3. Improved Snapshot Debugging: By providing a visual representation of your snapshots, jest-preview can help you better understand and debug your component changes.

Cons of nvh95/jest-preview

1. Limited Scope: While jest-preview is a useful tool for snapshot testing, it is not as feature-rich as Storybook, which provides a more comprehensive development and testing environment for UI components.
2. Dependency on Jest: jest-preview is tightly coupled with the Jest testing framework, which may not be suitable for all projects or testing setups.
3. Smaller Community: Compared to Storybook, which has a large and active community, jest-preview has a smaller user base and may have fewer resources and support available.