From 990c25d4f328d49fa8c68412b458e94a2de4aaf4 Mon Sep 17 00:00:00 2001
From: Dirk Ziegelmeier <dirk@ziegelmeier.net>
Date: Fri, 12 Jan 2018 12:37:16 +0100
Subject: [PATCH] Add unit test for a long running timer

---
 src/include/lwip/arch.h      |  3 +++
 test/unit/core/test_timers.c | 35 ++++++++++++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/src/include/lwip/arch.h b/src/include/lwip/arch.h
index 707c7918..069060ff 100644
--- a/src/include/lwip/arch.h
+++ b/src/include/lwip/arch.h
@@ -203,6 +203,9 @@ typedef int ssize_t;
 #define SSIZE_MAX INT_MAX
 #endif /* SSIZE_MAX */
 
+/* some maximum values needed in lwip code */
+#define LWIP_UINT32_MAX 0xffffffff
+
 /** Define this to 1 in arch/cc.h of your port if your compiler does not provide
  * the ctype.h header. If ctype.h is available, a few character functions
  * are mapped to the appropriate functions (lwip_islower, lwip_isdigit...), if
diff --git a/test/unit/core/test_timers.c b/test/unit/core/test_timers.c
index 39804230..820b7189 100644
--- a/test/unit/core/test_timers.c
+++ b/test/unit/core/test_timers.c
@@ -187,6 +187,38 @@ START_TEST(test_timers)
 }
 END_TEST
 
+START_TEST(test_long_timer)
+{
+  LWIP_UNUSED_ARG(_i);
+
+  memset(&fired, 0, sizeof(fired));
+  lwip_sys_now = 0;
+
+  sys_timeout(LWIP_UINT32_MAX / 4, dummy_handler, LWIP_PTR_NUMERIC_CAST(void*, 0));
+  fail_unless(sys_timeouts_sleeptime() == LWIP_UINT32_MAX / 4);
+
+  sys_check_timeouts();
+  fail_unless(fired[0] == 0);
+
+  lwip_sys_now += LWIP_UINT32_MAX / 8;
+
+  sys_check_timeouts();
+  fail_unless(fired[0] == 0);
+
+  lwip_sys_now += LWIP_UINT32_MAX / 8;
+
+  sys_check_timeouts();
+  fail_unless(fired[0] == 0);
+
+  lwip_sys_now += 1;
+
+  sys_check_timeouts();
+  fail_unless(fired[0] == 1);
+
+  sys_untimeout(dummy_handler, LWIP_PTR_NUMERIC_CAST(void*, 0));
+}
+END_TEST
+
 /** Create the suite including all tests for this module */
 Suite *
 timers_suite(void)
@@ -194,7 +226,8 @@ timers_suite(void)
   testfunc tests[] = {
     TESTFUNC(test_bug52748),
     TESTFUNC(test_cyclic_timers),
-    TESTFUNC(test_timers)
+    TESTFUNC(test_timers),
+    TESTFUNC(test_long_timer),
   };
   return create_suite("TIMERS", tests, LWIP_ARRAYSIZE(tests), timers_setup, timers_teardown);
 }