function testSupport(options){
    var noop = function(){};
    if (!options.name) throw Error('test needs a name');
    if (!options.root) options.root = testSupport.results = {};
    if (!options.success) options.success = noop;
    if (!options.failure) options.failure = noop;
    var run = function(options){
        var result = (typeof options.test === 'function') ? options.test(options) : options.test;
        options.root[options.name] = result;
        ([options.failure, options.success][+result])(options);
        return result;
    };

    var result = run(options);
    if (!result && options.retest) result = run(options);
    return options.root[options.name] = result;
}