ランダムに抽選する関数の確率テスト(Golang) - Qiita

package main import ( "math/rand" "time" ) func lotteryOneUserFromUsers(userIDs []string) string { rand.Seed(time.Now().UnixNano()) userID := userIDs[rand.Intn(len(userIDs))] return userID } package main import ( "fmt" "math" "testing" ) func Test_lotteryOneUserFromUsers(t *testing.T) { // initialize userIDs := []string{"a", "b", "c", "d", "e"} counts := make(map[string]int) for _, id := range use