Fixing failure of unit tests

1 - Existing IPv4 tests do not like automatic IPv6 traffic. Disabling ND
in unit test mode

2 - Timer test assumed there were only 3 timers started up by the stack
during initialization. This number has been increased to 4 (since we
added a new timer for router advertisements delivery).

modules/pico_ipv6.c

@@ -1138,12 +1138,15 @@ int pico_ipv6_link_add(struct pico_device *dev, struct pico_ip6 address, struct
      *     the solicited-node multicast address corresponding to each of the IP
      *     addresses assigned to the interface. (RFC 4861 $7.2.1)
      */
+
+#ifndef UNIT_TEST
     /* Duplicate Address Detection */
     if (!pico_ipv6_is_unspecified(address.addr)) {
         new->istentative = 1;
         pico_icmp6_neighbor_solicitation(dev, &address, PICO_ICMP6_ND_DAD);
         pico_timer_add(pico_rand() % PICO_ICMP6_MAX_RTR_SOL_DELAY, &pico_ipv6_nd_dad, &new->address);
     }
+#endif
 
     pico_ipv6_to_string(ipstr, new->address.addr);
     dbg("Assigned ipv6 %s to device %s\n", ipstr, new->dev->name);

test/unit/unit_timer.c

@@ -1,4 +1,4 @@
-
+#define EXISTING_TIMERS 4
 
 START_TEST (test_timers)
 {
@@ -11,15 +11,15 @@ START_TEST (test_timers)
     }
     for (i = 0; i < 128; i++) {
         fail_if(i + 1 > Timers->n);
-        fail_unless(Timers->top[i + 3].tmr == T[i]);
+        fail_unless(Timers->top[i + EXISTING_TIMERS].tmr == T[i]);
         fail_unless(T[i]->timer == (0xff00 + i));
         fail_unless(T[i]->arg == (0xaa00 + i));
     }
     for (i = 0; i < 128; i++) {
         printf("Deleting timer %d \n", i );
         pico_timer_cancel(T[i]);
         printf("Deleted timer %d \n", i );
-        fail_unless(Timers->top[i + 3].tmr == NULL);
+        fail_unless(Timers->top[i + EXISTING_TIMERS].tmr == NULL);
     }
     pico_stack_tick();
     pico_stack_tick();