refactor

kadai4/main.go

@@ -3,16 +3,13 @@ package main
 import (
 	"encoding/json"
 	"log"
-	"math/rand"
 	"net/http"
 	"time"
 
 	"github.com/gopherdojo/dojo6/kadai4/omikuji"
 )
 
 func main() {
-	rand.Seed(time.Now().UnixNano())
-
 	http.HandleFunc("/", handler)
 	http.ListenAndServe(":8080", nil)
 }
@@ -24,9 +21,16 @@ type Response struct {
 func handler(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 
-	_, m, d := time.Now().Date()
-	ret := omikuji.Do(int(m), d)
-	res := Response{Msg: ret}
+	omikuji := omikuji.Omikuji{time.Now()}
+	ret, err := omikuji.Do()
+	res := Response{}
+
+	if err != nil {
+		res.Msg = err.Error()
+		log.Println("Error:", err)
+	} else {
+		res.Msg = ret
+	}
 
 	if err := json.NewEncoder(w).Encode(res); err != nil {
 		log.Println("Error:", err)

kadai4/main_test.go

@@ -26,7 +26,6 @@ func TestHandler(t *testing.T) {
 	}
 
 	res := &Response{}
-	// TODO: 実行時のseeder設定により、大吉しか返ってないので、テストが通る
 	const expected = "大吉"
 	if err := json.Unmarshal(b, res); err != nil {
 		t.Fatalf("JSON unmarshall error: %v", err)

kadai4/omikuji/omikuji.go

@@ -1,7 +1,9 @@
 package omikuji
 
 import (
+	"fmt"
 	"math/rand"
+	"time"
 )
 
 var omikuji = map[int]string{
@@ -13,19 +15,37 @@ var omikuji = map[int]string{
 	5: "大吉",
 }
 
-func Do(month, day int) string {
+type Omikuji struct {
+	Time time.Time
+}
+
+func (o *Omikuji) SetSeed(seed int64) {
+	rand.Seed(seed)
+}
+
+type OmikujiError struct {
+	Msg string
+}
+
+func (err *OmikujiError) Error() string {
+	return fmt.Sprintf(err.Msg)
+}
+
+func (o *Omikuji) Do() (string, error) {
 	var i int
+
+	_, m, d := o.Time.Date()
 	// 1/1 ~ 1/3のみ大吉を出す
-	if month == 1 && day >= 1 && day <= 3 {
+	if int(m) == 1 && d >= 1 && d <= 3 {
 		i = 5
 	} else {
 		i = rand.Intn(len(omikuji))
 	}
 
 	s, ok := omikuji[i]
 	if !ok {
-		panic("omikuji panic.")
+		return "", &OmikujiError{"おみくじが引けませんでした。"}
 	}
 
-	return s
+	return s, nil
 }

kadai4/omikuji/omikuji_test.go

@@ -2,11 +2,22 @@ package omikuji_test
 
 import (
 	"testing"
+	"time"
 
 	"github.com/gopherdojo/dojo6/kadai4/omikuji"
 )
 
-func Test_SpecificPeriodLottery(t *testing.T) {
+func Test_NormalTime(t *testing.T) {
+	time := time.Date(2019, time.Month(8), 16, 0, 0, 0, 0, time.Local)
+	omikuji := omikuji.Omikuji{time}
+	expect := "大吉"
+	actual, _ := omikuji.Do()
+	if expect != actual {
+		t.Errorf(`Omikuji error: expect="%s" actual="%s"`, expect, actual)
+	}
+}
+
+func Test_SpecificPeriod(t *testing.T) {
 	periods := map[int][]int{
 		1: {1, 2, 3},
 	}
@@ -15,11 +26,11 @@ func Test_SpecificPeriodLottery(t *testing.T) {
 
 	for m, days := range periods {
 		for _, d := range days {
-			for i := 0; i < 20; i++ {
-				actual := omikuji.Do(m, d)
-				if expect != actual {
-					t.Errorf(`Omikuji error: expect="%s" actual="%s"`, expect, actual)
-				}
+			time := time.Date(2019, time.Month(m), d, 0, 0, 0, 0, time.Local)
+			omikuji := omikuji.Omikuji{time}
+			actual, _ := omikuji.Do()
+			if expect != actual {
+				t.Errorf(`Omikuji error: expect="%s" actual="%s"`, expect, actual)
 			}
 		}
 	}