Example composer.json.

gistfile1.json

{
    "name": "organization/packagename",
    "description": "A package for the ages.",
    "authors": [
        {
            "name": "Main Author",
            "email": "main.author@example.com"
        },
        {
            "name": "Other Author",
            "email": "other.author@example.com"
        }
    ],
    "minimum-stability": "dev",
    "autoload": { 
        "psr-0": {
            "PackageName": "src/"
        }
    },    
    "require": {
        "php": ">=5.3.0"
    },
    "require-dev": { 
        "mockery/mockery": "0.7.*"
    }
}