dns: Verify setting/getting servers in unit test

test/unit/Filelists.cmake

@@ -18,6 +18,7 @@ set(LWIP_TESTFILES
 	${LWIP_TESTDIR}/api/test_sockets.c
 	${LWIP_TESTDIR}/arch/sys_arch.c
 	${LWIP_TESTDIR}/core/test_def.c
+	${LWIP_TESTDIR}/core/test_dns.c
 	${LWIP_TESTDIR}/core/test_mem.c
 	${LWIP_TESTDIR}/core/test_netif.c
 	${LWIP_TESTDIR}/core/test_pbuf.c

test/unit/Filelists.mk

@@ -34,6 +34,7 @@ TESTFILES=$(TESTDIR)/lwip_unittests.c \
 	$(TESTDIR)/api/test_sockets.c \
 	$(TESTDIR)/arch/sys_arch.c \
 	$(TESTDIR)/core/test_def.c \
+	$(TESTDIR)/core/test_dns.c \
 	$(TESTDIR)/core/test_mem.c \
 	$(TESTDIR)/core/test_netif.c \
 	$(TESTDIR)/core/test_pbuf.c \

test/unit/core/test_dns.c

@@ -0,0 +1,52 @@
+#include "test_dns.h"
+
+#include "lwip/dns.h"
+
+/* Setups/teardown functions */
+
+static void
+dns_setup(void)
+{
+}
+
+static void
+dns_teardown(void)
+{
+}
+
+/* Test functions */
+
+START_TEST(test_dns_set_get_server)
+{
+  int i;
+  LWIP_UNUSED_ARG(_i);
+
+  for (i = 0; i < 256; i++) {
+    ip_addr_t server;
+    /* Should return a zeroed address for any index */
+    fail_unless(dns_getserver(i));
+    fail_unless(ip_addr_isany(dns_getserver(i)));
+
+    /* Should accept setting address for any index, and ignore if out of range */
+    IP_ADDR4(&server, 10, 0, 0, i);
+    dns_setserver(i, &server);
+    fail_unless(dns_getserver(i));
+    if (i < DNS_MAX_SERVERS) {
+      /* ip_addr_cmp returns 1 if they match. */
+      fail_unless(ip_addr_cmp(dns_getserver(i), &server) == 1);
+    } else {
+      fail_unless(ip_addr_isany(dns_getserver(i)));
+    }
+  }
+}
+END_TEST
+
+/** Create the suite including all tests for this module */
+Suite *
+dns_suite(void)
+{
+  testfunc tests[] = {
+    TESTFUNC(test_dns_set_get_server)
+  };
+  return create_suite("DNS", tests, sizeof(tests)/sizeof(testfunc), dns_setup, dns_teardown);
+}

test/unit/core/test_dns.h

@@ -0,0 +1,8 @@
+#ifndef LWIP_HDR_TEST_DNS_H
+#define LWIP_HDR_TEST_DNS_H
+
+#include "../lwip_check.h"
+
+Suite *dns_suite(void);
+
+#endif

test/unit/lwip_unittests.c

@@ -6,6 +6,7 @@
 #include "tcp/test_tcp.h"
 #include "tcp/test_tcp_oos.h"
 #include "core/test_def.h"
+#include "core/test_dns.h"
 #include "core/test_mem.h"
 #include "core/test_netif.h"
 #include "core/test_pbuf.h"
@@ -78,6 +79,7 @@ int main(void)
     tcp_suite,
     tcp_oos_suite,
     def_suite,
+    dns_suite,
     mem_suite,
     netif_suite,
     pbuf_suite,