hello %s

hello.go

@@ -2,10 +2,10 @@ package main
 
 import "fmt"
 
-func Hello() string {
-	return "Hello world"
+func Hello(name string) string {
+	return fmt.Sprintf("Hello %s", name)
 }
 
 func main() {
-	fmt.Println(Hello())
+	fmt.Println(Hello("Mary"))
 }

hello_test.go

@@ -3,8 +3,8 @@ package main
 import "testing"
 
 func TestHello(t *testing.T) {
-	got := Hello()
-	exp := "Hello world"
+	got := Hello("Jason")
+	exp := "Hello Jason"
 	if got != exp {
 		t.Errorf("got %q expected %q", got, exp)
 	}