function someFunction(a, b, c) {
    args(someFunction, function(){
        args.expect(a).toBeDefined();
        args.expect(c).not.toBeTruthy();
    });
}

function someFunction(a, b, c) {
    args(someFunction, () => {
        args.expect(a).toBeDefined();
        args.expect(c).not.toBeTruthy();
    });
}

function someFunction(a, b, c, success, err) {
    if (args(someFunction, 
             function(){ 
                args.expect(a).toBeDefined();
             }, 
             err)) {
        return;
    }
}