Handle empty string as "World"

hello.go

@@ -2,8 +2,13 @@ package main
 
 import "fmt"
 
+const englishHelloPrefix = "Hello, "
+
 func Hello(name string) string {
-	return "Hello, " + name
+	if name == "" {
+		name = "World"
+	}
+	return englishHelloPrefix + name
 }
 
 func main() {

hello_test.go

@@ -3,10 +3,20 @@ package main
 import "testing"
 
 func TestHello(t *testing.T) {
+	t.Run("saying hello to people", func(t *testing.T) {
 		got := Hello("Hoborg")
 		want := "Hello, Hoborg"
 
 		if got != want {
 			t.Errorf("got %q want %q", got, want)
 		}
+	})
+	t.Run("say 'Hello, World' when an empty string is given", func(t *testing.T) {
+		got := Hello("")
+		want := "Hello, World"
+
+		if got != want {
+			t.Errorf("got %q want %q", got, want)
+		}
+	})
 }