Default to the first message if name is empty

hello.go

@@ -5,6 +5,10 @@ import "fmt"
 const englishHelloPrefix = "Hello, "
 
 func Hello(name string) string {
+	if name == "" {
+		name = "World"
+	}
+
 	return englishHelloPrefix + name
 }
 

hello_test.go

@@ -11,4 +11,13 @@ func TestHello(t *testing.T) {
 			t.Errorf("got %q want %q", got, want)
 		}
 	})
+
+	t.Run("say 'Hello, World' when an empty string is supplied", func (t *testing.T) {
+		got := Hello("")
+		want := "Hello, World"
+
+		if got != want {
+			t.Errorf("got %q want %q", got, want)
+		}
+	})
 }