How to test panics?

Question

I\'m currently pondering how to write tests that check if a given piece of code panicked? I know that Go uses recover to catch panics, but unlike say, Java code, you can\'t

Answer 1

You can test which function paniced by giving panic an input

package main

import "fmt"

func explode() {
    // Cause a panic.
    panic("WRONG")
}

func explode1() {
    // Cause a panic.
    panic("WRONG1")
}

func main() {
    // Handle errors in defer func with recover.
    defer func() {
        if r := recover(); r != nil {
            var ok bool
            err, ok := r.(error)
            if !ok {
                err = fmt.Errorf("pkg: %v", r)
                fmt.Println(err)
            }
        }

    }()
    // These causes an error. change between these
    explode()
    //explode1()

    fmt.Println("Everything fine")

}

http://play.golang.org/p/ORWBqmPSVA