defer func() {
		os.Stdout = oldStdout
	}()

	r, w, err := os.Pipe()
	if err != nil {
		t.Fatal(err)
	}
	defer r.Close()
	defer w.Close()

	go func() {
		os.Stdout = w
		Example_rand()
		os.Stdout = oldStdout
		w.Close()
	}()
	out, err := io.ReadAll(r)
	if err != nil {
		t.Fatal(err)
	}

	var buf bytes.Buffer
	fmt.Fprintf(&buf, "\t// Output:\n")