}
	}
	pause := time.Duration(scale) * 10 * time.Millisecond

	lvl := os.Getenv("GO_TEST_TERMINAL_SIGNALS")
	switch lvl {
	case "":
		// Main test process, run code below.
		break
	case "1":
		runSessionLeader(t, pause)
		panic("unreachable")
	case "2":
		runStoppingChild()
		panic("unreachable")
	default:
		fmt.Fprintf(os.Stderr, "unknown subprocess level %s\n", lvl)
		os.Exit(1)
	}

	t.Parallel()