package hello import ( "testing" "net/http/httptest" ) func TestHelloHandler(t *testing.T) { w := httptest.NewRecorder() req := httptest.NewRequest("GET", "/hello", nil) HelloHandler(w, req) expected := "Hello, World!" if w.Body.String() != expected { t.Errorf("Expected %q but got %q", expected, w.Body.String()) } }