--TEST--
Tries to require a package with the same name as the root package
--COMPOSER--
{
    "name": "foo/bar",
    "require": {
        "foo/bar": "@dev"
    }
}
--RUN--
install
--EXPECT-EXCEPTION--
RuntimeException
--EXPECT--
Root package 'foo/bar' cannot require itself in its composer.json
Did you accidentally name your root package after an external package?