[type] add testing for load() and add time.Time mock

Author: imura81gt

kadai3/imura81gt/typ/main.go

@@ -3,5 +3,6 @@ package main
 import "github.com/gopherdojo/dojo7/kadai3/imura81gt/typ/typing"
 
 func main() {
-	typing.Run()
+	g := typing.Game{}
+	g.Run()
 }

kadai3/imura81gt/typ/typing/typing.go

@@ -10,6 +10,30 @@ import (
 	"time"
 )
 
+// ----- for time
+type Clock interface {
+	Now() time.Time
+}
+
+type ClockFunc func() time.Time
+
+func (f ClockFunc) Now() time.Time {
+	return f()
+}
+
+type Game struct {
+	Clock Clock
+}
+
+func (g *Game) now() time.Time {
+	if g.Clock == nil {
+		return time.Now()
+	}
+	return g.Clock.Now()
+}
+
+// -----------
+
 func input(r io.Reader) <-chan string {
 	ch := make(chan string)
 	go func() {
@@ -26,9 +50,9 @@ func input(r io.Reader) <-chan string {
 	return ch
 }
 
-func load() string {
+func (g *Game) load() string {
 	var ws = []string{"すもも", "もも"}
-	rand.Seed(time.Now().UnixNano())
+	rand.Seed(g.now().UnixNano())
 	w1 := ws[rand.Intn(len(ws))]
 	w2 := ws[rand.Intn(len(ws))]
 	w3 := ws[rand.Intn(len(ws))]
@@ -41,7 +65,7 @@ func show(score int, chars int, txt string, out io.Writer) {
 }
 
 // Run is a function to start typing-game.
-func Run() {
+func (g *Game) Run() {
 
 	ctx := context.Background()
 	ctx, cancel := context.WithCancel(ctx)
@@ -56,7 +80,7 @@ func Run() {
 	var score int
 	var chars int
 
-	txt := load()
+	txt := g.load()
 
 	show(score, chars, txt, os.Stdout)
 
@@ -68,7 +92,7 @@ B:
 				fmt.Println("GOOD!!!")
 				score++
 				chars = chars + len([]rune(txt))
-				txt = load()
+				txt = g.load()
 				show(score, chars, txt, os.Stdout)
 			} else {
 				fmt.Println("BAD....")

kadai3/imura81gt/typ/typing/typing_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"testing"
+	"time"
 )
 
 func TestInput(t *testing.T) {
@@ -38,7 +39,23 @@ func TestInput(t *testing.T) {
 
 }
 
-func TestLoad(t *testing.T) {}
+func TestLoad(t *testing.T) {
+	g := Game{
+		Clock: ClockFunc(func() time.Time {
+			return time.Date(2019, 11, 04, 02, 0, 0, 0, time.UTC)
+		}),
+	}
+
+	expected := "すもももももももものうち"
+	actual := g.load()
+	if actual != expected {
+		t.Errorf("\ncaseName:%s\nactual:%+v\nExpected:%+v\n",
+			"load test",
+			actual,
+			expected,
+		)
+	}
+}
 
 func TestShow(t *testing.T) {
 	testcases := []struct {