---
title: Contributing
---
# Contributing
* Coding standard for the project is [PSR-2](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)
* The project will follow strict [object calisthenics](http://www.slideshare.net/guilhermeblanco/object-calisthenics-applied-to-php)
* Any contribution must provide tests for additional introduced conditions
* Any un-confirmed issue needs a failing test case before being accepted
* Pull requests must be sent from a new hotfix/feature branch, not from `master`.
## Installation
To install the project and run the tests, you need to clone it first:
```sh
$ git clone git://github.com/Ocramius/PackageVersions.git
```
You will then need to run a composer installation:
```sh
$ cd PackageVersions
$ curl -s https://getcomposer.org/installer | php
$ php composer.phar update
```
## Testing
The PHPUnit version to be used is the one installed as a dev- dependency via composer:
```sh
$ ./vendor/bin/phpunit
```
Accepted coverage for new contributions is 80%. Any contribution not satisfying this requirement
won't be merged.