How to test deferred Go statements?

How can I test doStuff function? (Playground: http://ift.tt/1sWgNAd)

package main

import "fmt"

func doStuff() {
    defer unlock()
    lock()
    // some
    // task
    // here
}

func lock() {
    fmt.Println("locked")
}

func unlock() {
    fmt.Println("unlocked")
}

In other words: how to test code that uses defer statements? What general strategies should be used to test deferred calls? If there are no general practice, how to test this specific code?