for (int u = 0; u <=7; u++) {
            for (int g = 0; g <= 7; g++) {
                for (int o = 0; o <= 7; o++) {
                    String symbolicNotation = String.format("%s%s%s", toUnixSymbolic(u), toUnixSymbolic(g), toUnixSymbolic(o));
                    int mode = u * 64 + g * 8 + o;
                    assertEquals(mode, newUnixPermission(symbolicNotation).toUnixNumeric());
                }
            }
        }
    }