{
    "name": "roundcube/plugin-installer-test",
    "require": {
        "roundcube/carddav": "^4 || ^5"
    },
    "repositories": [
        {
            "type": "git",
            "url": "https://github.com/roundcube/roundcubemail.git"
        },
        {
            "type": "path",
            "url": ".."
        }
    ],
    "minimum-stability": "dev",
    "prefer-stable": true,
    "config": {
        "allow-plugins": {
            "roundcube/plugin-installer": true
        }
    }
}

• [F] composer.json
  Delete