### Question:
PacketNumber { public static long next(final long number) { return number + 1; } private  PacketNumber(); static long parse(final byte[] b); static long validate(final long number); static long next(final long number); static int getLength(final long number); static byte[] write(final long number, final int length); static final long MIN; }### Answer:
@Test public void next() { final long pn = 123; assertEquals(124, PacketNumber.next(pn)); }