Thanks!

It's the same for every language now, I think people will get it that we are using slices in Go, so don't worry about it. Test cases looks good now, approved, thanks.

Fixed, sorry for these mistakes. Mutation should be tested now, also copied your tests, grouped by length 10, 100, 1000, 10000.
Want to ask, do kata description is same on every language? Because if it isn't, maybe it's better to name lists as Go slices.

I have two issues with your translation - first of all, include the tests for input mutation - arrays/slices in Go are mutable, so to be consistent with the description, the tests need to include that. Secondly, I feel like your random tests are a bit too random, since you are just running 20 randomly sized arrays with random elements. It is totally possible to produce a test suite with 20 arrays of sizes not exceeding 50. Not likely, but probable. Try to make it so there's at least one test for big arrays (10000 elements). I know that this kata is really easy, but testing should always be exhaustive.

Go (Golang) translation.
My first translation, i hope it's okay xd