--TEST--
Composer installers are installed first if they have no meaningful requirements
--COMPOSER--
{
    "repositories": [
        {
            "type": "package",
            "package": [
                { "name": "pkg", "version": "1.0.0" },
                { "name": "pkg2", "version": "1.0.0" },
                { "name": "inst", "version": "1.0.0", "type": "composer-plugin" },
                { "name": "inst-with-req", "version": "1.0.0", "type": "composer-plugin", "require": { "php": ">=5", "ext-json": "*", "composer-plugin-api": "*" } },
                { "name": "inst-with-req2", "version": "1.0.0", "type": "composer-plugin", "require": { "pkg2": "*" } }
            ]
        }
    ],
    "require": {
        "pkg": "1.0.0",
        "inst": "1.0.0",
        "inst-with-req2": "1.0.0",
        "inst-with-req": "1.0.0"
    }
}
--RUN--
install
--EXPECT--
Installing inst (1.0.0)
Installing inst-with-req (1.0.0)
Installing pkg (1.0.0)
Installing pkg2 (1.0.0)
Installing inst-with-req2 (1.0.0)
