I dislike the whole interview process, I'm only young so the interviewing process is still very new to me. We find that people lie heavily on CVs to the point where it is annoying. We had someone once who had 5 years CSS experience yet found it hard to center some text.
I think an online test would help our cause some but I don't know how simple to make some of the questions. How long would you expect the candidate to be taking the test? Do you tailor the test to the candidates?
It's dunning-kruger and lying in full swing, I feel.
Some people go like "Oh I worked 5 years in that tool, I must be magnificient in this tool. I shall list myself as highly professional in this area!" and do so.
Me... I rather go like "Hmm... Well I worked with C for 3-4 years, but I'm rusty as hell... and I didn't touch many libraries much, I just worked on tiny microcontrollers and implemented a highly multithreaded programming language execution environment. Guess I'm gonna call me <somewhat experienced> there." Though afterwards I just roll over people in an interview.
I just can't understand how people don't score 100%. Alas, not many do.
It's saved us devs a HUGE amount of time.