I updated from 1.0.0-alpha9 825b4b9 to b8ac790 today and most project builds are failing due to vendor/bin no longer being part of the subshell path that composer run-script and composer test use.

Code like the following worked for over a year until this week:

{
    "require-dev": {
        "jakub-onderka/php-parallel-lint": "0.8.*",
        "phpunit/phpunit": "3.7.*",
        "squizlabs/php_codesniffer": "1.*"
    },
    "scripts": {
        "test": [
            "parallel-lint --exclude vendor .",
            "phpunit",
            "phpcs . --standard=./test/codesniffer --ignore=vendor/* --tab-width=4"
        ]
    }
}

Affecting local builds, Jenkins, and Travis CI. Afaik this is documented behaviour according to https://getcomposer.org/doc/articles/scripts.md#writing-custom-commands. And matches npm's behaviour (https://docs.npmjs.com/misc/scripts#path) which I imagine its inspired by..