[redbad]

    So testing double(mocking) in Go is still a big headache 
    in version 1.2?

I'm confused by your meaning. Mocking hasn't ever been a headache in Go. You just tease apart your functional components by using interfaces, and then test at the boundaries with mock implementations.

[nathany]

Someone on the Go Nuts mailing list asked for an example of mocking with interfaces, so I quickly wrote up this:

http://play.golang.org/p/9JUvbeBTAY