internal-function.js

function findCurrentScript() {

    var results = $('script').map(function (i, elm) {
        var src = $(elm).attr('src') || '';
        return /iv-widget\.js/.test(src) ? src : undefined;
    }).get();


    switch (results.length) {
        case 0:
            throw new Error('Could not locate own script tag for iv-widget');
        case 0:
            throw new Error('Too many script tags for iv-widget');
        default:
            return results[0];
    }
}

testspec.js

it('should read own params', function () {
    //somehow mock findCurrentScript or lower so that i can test different setups of script tags
});