fix tests [20] --filter=[core]

Author: matyhtf

core-tests/src/network/dns.cpp

@@ -54,7 +54,8 @@ TEST(dns, domain_not_found) {
 TEST(dns, bad_family) {
     test::coroutine::run([](void *arg) {
         auto list = swoole::coroutine::dns_lookup("www.google.com", 9999, 2);
-        ASSERT_GE(list.size(), 1);
+        ASSERT_EQ(list.size(), 0);
+        ASSERT_ERREQ(SW_ERROR_DNSLOOKUP_RESOLVE_FAILED);
     });
 }
 

src/network/dns.cc

@@ -770,6 +770,7 @@ std::string gethostbyname(int type, const std::string &name) {
     if (gethostbyname(type, name.c_str(), addr) == SW_OK) {
         return Address::addr_str(type, addr);
     }
+    swoole_set_last_error(SW_ERROR_DNSLOOKUP_RESOLVE_FAILED);
     return {};
 }