specify posix.sys.time:
- before:
    systime = require "posix.sys.time"


- describe gettimeofday:
  - before:
      gettimeofday = systime.gettimeofday

  - context with bad arguments:
      badargs.diagnose (gettimeofday, "()")

  - it returns a PosixTimeval:
      expect (prototype (gettimeofday ())).to_be "PosixTimeval"
  - it fetches the current epoch time:
      tv, epoch = gettimeofday (), posix.time ()
      expect (tv.tv_sec).to_be (epoch)
      expect (type (tv.tv_usec)).to_be "number"
      expect (tv.tv_usec >= 0).to_be (true)