hello default world

hello.go

@@ -3,6 +3,9 @@ package main
 import "fmt"
 
 func Hello(name string) string {
+	if name == "" {
+		return "Hello world"
+	}
 	return fmt.Sprintf("Hello %s", name)
 }
 

hello_test.go

@@ -3,9 +3,19 @@ package main
 import "testing"
 
 func TestHello(t *testing.T) {
+	t.Run("Hello someone", func(t *testing.T) {
 		got := Hello("Jason")
 		exp := "Hello Jason"
 		if got != exp {
 			t.Errorf("got %q expected %q", got, exp)
 		}
+	})
+
+	t.Run("Hello default", func(t *testing.T) {
+		got := Hello("")
+		exp := "Hello world"
+		if got != exp {
+			t.Errorf("got %q expected %q", got, exp)
+		}
+	})
 }