A simple CracklePop (FizzBuzz) program in Go

cracklepop.go

package main

import (
  "fmt"
  "strconv"
)

const crackle, pop = "Crackle", "Pop"

func CracklePop(i int) (res string) {
  switch {
  case i % 5 == 0 && i % 3 == 0:
    res = crackle + pop
  case i % 5 == 0:
    res = pop
  case i % 3 == 0:
    res = crackle
  default:
    res = strconv.Itoa(i)
  }
  return
}

func runCracklePop(i int, max int) {
  for ; i <= max; i++ {
    fmt.Println(CracklePop(i))
  }
}

func main() {
  runCracklePop(1, 100)
}

cracklepop_test.go

package main

import "testing"

func cracklePopTestCase(t *testing.T, in int, out string) {
  if res := CracklePop(in); res !=  out {
    t.Errorf("CracklePop(%v) = %s, want %s", in, res, out)
  }
}

func TestCracklePop(t *testing.T) {
  cracklePopTestCase(t, 1, "1")
  cracklePopTestCase(t, 3, "Crackle")
  cracklePopTestCase(t, 5, "Pop")
  cracklePopTestCase(t, 15, "CracklePop")
}