@RepeatedTest(2)
    void verifyDeleteNullTicket() throws Throwable {
        val ticketGrantingTicketId = TestTicketIdentifiers.generate().ticketGrantingTicketId();
        ticketRegistry.addTicket(new TicketGrantingTicketImpl(ticketGrantingTicketId,
            CoreAuthenticationTestUtils.getAuthentication(),
            NeverExpiresExpirationPolicy.INSTANCE));
        assertNotEquals(1, ticketRegistry.deleteTicket(StringUtils.EMPTY), "Ticket was deleted.");
    }
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