The IQ test is one of them, although i don’t know how accurate it is, i had 120 when i was 13 and i turned out to be a nerdy retard ;)

I guess it depends on what you define as intelligence. The turing test says that it’s the ability to pass as a human in conversation. IQ tests test other things. Others might define it as the ability to learn and solve problems, that’s how they test the intelligence of an octopus.