Add unit test for tor_addr_is_loopback

src/test/test_addr.c

@@ -623,12 +623,48 @@ test_addr_ip6_helpers(void)
   ;
 }
 
+static void
+test_addr_is_loopback(void *data)
+{
+  static const struct loopback_item {
+    const char *name;
+    int is_loopback;
+  } loopback_items[] = {
+    { "::1", 1 },
+    { "127.0.0.1", 1 },
+    { "127.99.100.101", 1 },
+    { "128.99.100.101", 0 },
+    { "8.8.8.8", 0 },
+    { "0.0.0.0", 0 },
+    { "::2", 0 },
+    { "::", 0 },
+    { "::1.0.0.0", 0 },
+    { NULL, 0 }
+  };
+
+  int i;
+  tor_addr_t addr;
+  (void)data;
+
+  for (i=0; loopback_items[i].name; ++i) {
+    tt_int_op(tor_addr_parse(&addr, loopback_items[i].name), >=, 0);
+    tt_int_op(tor_addr_is_loopback(&addr), ==, loopback_items[i].is_loopback);
+  }
+
+  tor_addr_make_unspec(&addr);
+  tt_int_op(tor_addr_is_loopback(&addr), ==, 0);
+
+ done:
+  ;
+}
+
 #define ADDR_LEGACY(name)                                               \
   { #name, legacy_test_helper, 0, &legacy_setup, test_addr_ ## name }
 
 struct testcase_t addr_tests[] = {
   ADDR_LEGACY(basic),
   ADDR_LEGACY(ip6_helpers),
+  { "is_loopback", test_addr_is_loopback, 0, NULL, NULL },
   END_OF_TESTCASES
 };