https://www.codewars.com/kata/rotate-for-a-max/train/go IN PROCESS

kata-rotate.go

package kata

import (
  "sort"
  "strings"
  "strconv"
)

func MaxRot(n int64) int64 {
   ints := strings.Split(strconv.FormatInt(n, 10), "")
   sort.Sort(sort.Reverse(sort.StringSlice(ints)))
   int_str := strings.Join(ints, "")
   max, _ := strconv.ParseInt(int_str, 10, 64)
   return max
}

kata_test.go

package kata_test
import (
  . "github.com/onsi/ginkgo"
  . "github.com/onsi/gomega"
  . "codewarrior/kata"
  
)

func dotest(n int64, exp int64) {
    var ans = MaxRot(n)
    Expect(ans).To(Equal(exp))
}

var _ = Describe("Tests MaxRot", func() {

    It("should handle basic cases", func() {
        dotest(38458215, 85821534)
        dotest(195881031, 988103115)
        dotest(896219342, 962193428)
        
    })
})