# Developer Guide

So you want to contribute code to the OpenSearch Node.js Client?  Excellent!  We're glad you're here.  Here's what you need to do:

## Getting Started

### Git Clone OpenSearch Node.js Client Repository

Fork [opensearch-project/opensearch-js](https://github.com/opensearch-project/opensearch-js) and clone locally,
e.g. `git clone https://github.com/[your username]/opensearch-js.git`.

### Install Prerequisites

#### Node.js 
The minimum supported version of Node.js is v10.

#### Docker

[Docker](https://docs.docker.com/install/) is required for building some OpenSearch artifacts and executing integration tests.

### Unit Testing
Go to your terminal and run:
```
cd folder-path
npm run test:unit
```
 
To run a specific unit test, you can use the following jest command. `npm test` will not work.
```
cd folder-path/to/test
jest TestName
```

If you don't have jest, you can install it via npm or yarn
```
npm i -g jest-cli
yarn global add jest-cli
```

### Integration Testing
In order to test opensearch-js client, you need a running OpenSearch cluster. You can use Docker to accomplish this. 
The [Docker Compose file](.ci/opensearch/docker-compose.yml) supports the ability to run integration tests for the project in local environments.
If you have not installed docker-compose, you can install it from this [link](https://docs.docker.com/compose/install/).

#### Execute integration tests from your terminal

1. Run below command to start containers. By default, it will launch latest OpenSearch cluster.
   ```
   cd folder-path/.ci/opensearch
   docker-compose up
   ```

2. Run all integration tests.
   ```
   npm run test:integration:helpers
   ```
5. Stop and clean containers.
   ```
   docker-compose down
   ```