[typ] refactor and add test for show()

Author: imura81gt

kadai3/imura81gt/typ/typing/typing.go

@@ -36,9 +36,8 @@ func load() string {
 	return fmt.Sprintf("%sも%sも%sのうち", w1, w2, w3)
 }
 
-func show(score int, chars int, txt string) {
-	fmt.Println(score, chars, ">", txt)
-	fmt.Print(score, chars, " > ")
+func show(score int, chars int, txt string, out io.Writer) {
+	fmt.Fprintf(out, "%d %d > %s\n%d %d > ", score, chars, txt, score, chars)
 }
 
 // Run is a function to start typing-game.
@@ -59,7 +58,7 @@ func Run() {
 
 	txt := load()
 
-	show(score, chars, txt)
+	show(score, chars, txt, os.Stdout)
 
 B:
 	for {
@@ -70,10 +69,10 @@ B:
 				score++
 				chars = chars + len([]rune(txt))
 				txt = load()
-				show(score, chars, txt)
+				show(score, chars, txt, os.Stdout)
 			} else {
 				fmt.Println("BAD....")
-				show(score, chars, txt)
+				show(score, chars, txt, os.Stdout)
 			}
 		case <-time.After(limit * time.Second):
 			fmt.Println()

kadai3/imura81gt/typ/typing/typing_test.go

@@ -0,0 +1,45 @@
+package typing
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+)
+
+func TestInput(t *testing.T) {}
+
+func TestLoad(t *testing.T) {}
+
+func TestShow(t *testing.T) {
+	testcases := []struct {
+		caseName string
+		score    int
+		char     int
+		txt      string
+		expected string
+	}{
+		{caseName: "score10char300", score: 10, char: 300, txt: "テスト", expected: "10 300 > テスト\n10 300 > "},
+	}
+
+	for _, tc := range testcases {
+		tc := tc // capture range variable. need to set when run parallel test.
+
+		fmt.Println(tc)
+		t.Run(tc.caseName, func(t *testing.T) {
+			t.Parallel()
+			var buf bytes.Buffer
+			show(tc.score, tc.char, tc.txt, &buf)
+			actual := buf.String()
+			if tc.expected != actual {
+				t.Errorf("\ncaseName:%s\nactual:%+v\nExpected:%+v\n",
+					tc.caseName,
+					actual,
+					tc.expected,
+				)
+			}
+		})
+	}
+
+}
+
+func TestRun(t *testing.T) {}