func drawsOk(t *testing.T, msg string, n tree.Node, s string) { got := strings.Trim(n.Draw(), "\n") want := strings.Trim(trim.ReplaceAllString(s, ""), "\n") if got != want { t.Errorf("%s failed\nexpected:\n[%s]\ngot:\n[%s]\n", msg, want, got) } }