package externalaccount import "testing" func TestError_Generator(t *testing.T) { e := Error{ "42", "http:thisIsAPlaceholder", "The Answer!", } output := "got error code " + "42" + " from " + "http:thisIsAPlaceholder" + ": " + "The Answer!" if got, want := e, output; e.Error() != output { t.Errorf("Got error message %q; want %q", got, want) } }