@RepeatedTest(2)
    void verifyGetTicketsIsZero() {
        ticketRegistry.deleteAll();
        assertEquals(0, ticketRegistry.getTickets().size(), "The size of the empty registry is not zero.");
    }
Exercise block of code in {@link AbstractTicketRegistry#getTicket(String ticketId)} that runs when
the method encounters a {@link Ticket} created in the future.
Adds 10 seconds to creation time to simulate time out of sync so warning will be logged.
core/cas-server-core-tickets/src/test/java/org/apereo/cas/ticket/registry/BaseTicketRegistryTests.java