fix data race

core/cmdline/input_test.go

@@ -14,22 +14,24 @@ import (
 func TestEnterToContinue(t *testing.T) {
 	r, w, err := os.Pipe()
 	assert.Nil(t, err)
+	ow := os.Stdout
+	os.Stdout = w
+	or := os.Stdin
+	os.Stdin = r
+	defer func() {
+		os.Stdin = or
+		os.Stdout = ow
+	}()
 
 	var wg sync.WaitGroup
 	wg.Add(2)
 	go func() {
 		defer wg.Done()
-		ow := os.Stdout
-		os.Stdout = w
 		fmt.Println()
-		os.Stdout = ow
 	}()
 	go func() {
 		defer wg.Done()
-		or := os.Stdin
-		os.Stdin = r
 		EnterToContinue()
-		os.Stdin = or
 	}()
 
 	wait := make(chan lang.PlaceholderType)
@@ -48,24 +50,26 @@ func TestEnterToContinue(t *testing.T) {
 func TestReadLine(t *testing.T) {
 	r, w, err := os.Pipe()
 	assert.Nil(t, err)
+	ow := os.Stdout
+	os.Stdout = w
+	or := os.Stdin
+	os.Stdin = r
+	defer func() {
+		os.Stdin = or
+		os.Stdout = ow
+	}()
 
 	const message = "hello"
 	var wg sync.WaitGroup
 	wg.Add(2)
 	go func() {
 		defer wg.Done()
-		ow := os.Stdout
-		os.Stdout = w
 		fmt.Println(message)
-		os.Stdout = ow
 	}()
 	go func() {
 		defer wg.Done()
-		or := os.Stdin
-		os.Stdin = r
 		input := ReadLine("")
 		assert.Equal(t, message, input)
-		os.Stdin = or
 	}()
 
 	wait := make(chan lang.PlaceholderType)