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react-test-attributes

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React library to add data-* attributes to DOM elements.

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# React Test Attributes

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[React Test Attributes](https://github.com/dennismorello/react-test-attributes) is a library for React apps that decorates the DOM with custom attributes that can be used to uniquely indentify elements in a page. The main use case is for E2E testing using tools like [Cypress](https://www.cypress.io) or [Selenium](https://selenium.dev).

## Table Of Contents

- [Features](#features)
- [Installation](#installation)
- [Quick Start](#quick-start)
- [Usage](#usage)
  - [API](#api)
  - [Global Configuration](#global-configuration)
- [Contributing](#contributing)
- [License](#license)

## Features

- 🏷 **TypeScript support** - It is written in TypeScript to make it easier and faster to use the library
- 🍃 **Lightweight** - Almost zero footprint on your project and no other dependencies required
- 🚀 **Production mode** - `data-*` attributes are added to the DOM only when not in production mode
- 🌳 **Tree-shakeable** - Only the parts you use will be included in your final bundle

## Installation

To add this package as a dependency to your app, simply run

```sh
npm install react-test-attributes --save
```

or, if you are using Yarn (as I strongly suggest):

```sh
yarn add react-test-attributes
```

## Quick Start

Import [React Test Attributes](https://www.npmjs.com/package/react-test-attributes) to your React component (note that, since it is the default export of this package, you can name it whatever you want):

```js
import Test from 'react-test-attributes';
```

Then simply wrap the components you want to decorate:

```jsx
<Test id="btn-submit">
  <button>Sumbit</button>
</Test>
```

The resulting DOM will be the following, depending on the value of `NODE_ENV` environment variable when your project is built:

```html

<button data-testid="btn-submit">Submit</button>

<button>Submit</button>
```

### Usage

#### API

The `Test` component accepts the following props:

- `id` is the value of the added attribute
- `suffix` is the string to append to `"data-"` when building the attribute name (default to `"testid"`)
- `enableInProductionMode` indicates whether or not adding the test attribute in production mode (default to `false`)

For example, if you want to name the attribute `data-tid` and give it the value `"link-home"` you should write:

```jsx
<Test id="link-home" suffix="tid">
  <a href="/home">Home</a>
</Test>
```

This produces the following DOM:

```html
<a href="/home" data-tid="link-home">Home</a>
```

#### Global Configuration

The context `TestAttributesConfig` can provide a global configuration to all of its `Test` descendants.

For example, we can globally override the suffix and enable writing the test attributes also in production mode by doing this:

```jsx
import Test, { TestAttributesConfig } from 'react-test-attributes';

const App = () => {
  return (
    <TestAttributesConfig
      value={{ suffix: 'tid', enableInProductionMode: true }}
    >
      <Test id="title">
        <h1>I am the title</h1>
      </Test>
      <Test id="link-home">
        <a href="/home">Home</a>
      </Test>
    </TestAttributesConfig>
  );
};
```

This produces the following DOM:

```html
<h1 data-tid="title">I am the title</h1>
<a href="/home" data-tid="link-home">Home</a>
```

## Contributing

If you find any bug or if you have ideas on how to improve this project, you are more than welcome to open issues and/or making pull requests!

## License

Project source code is licensed under the MIT license. You are free to fork this repository, edit the code, share and use it both for non-commercial and commercial purposes.

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