tests: avoided solving IPv6 addresses.

Author: agentzh

t/023-rewrite/tcp-socket.t

@@ -204,7 +204,7 @@ attempt to send data on a closed socket:
 --- timeout: 10
 --- config
     server_tokens off;
-    resolver $TEST_NGINX_RESOLVER;
+    resolver $TEST_NGINX_RESOLVER ipv6=off;
     resolver_timeout 3s;
     location /t {
         rewrite_by_lua '
@@ -296,7 +296,7 @@ qr/connect\(\) failed \(\d+: Connection refused\)/
 
 === TEST 6: connection timeout (tcp)
 --- config
-    resolver $TEST_NGINX_RESOLVER;
+    resolver $TEST_NGINX_RESOLVER ipv6=off;
     lua_socket_connect_timeout 100ms;
     lua_socket_send_timeout 100ms;
     lua_socket_read_timeout 100ms;
@@ -372,7 +372,7 @@ connected: 1
 === TEST 8: resolver error (host not found)
 --- config
     server_tokens off;
-    resolver $TEST_NGINX_RESOLVER;
+    resolver $TEST_NGINX_RESOLVER ipv6=off;
     resolver_timeout 3s;
     location /t {
         rewrite_by_lua '
@@ -415,7 +415,7 @@ attempt to send data on a closed socket
 === TEST 9: resolver error (timeout)
 --- config
     server_tokens off;
-    resolver 8.8.8.8;
+    resolver $TEST_NGINX_RESOLVER ipv6=off;
     resolver_timeout 1ms;
     location /t {
         rewrite_by_lua '

t/058-tcp-socket.t

@@ -2038,7 +2038,7 @@ resolve name done
 
 === TEST 34: github issue #215: Handle the posted requests in lua cosocket api (successfully resolved)
 --- config
-    resolver $TEST_NGINX_RESOLVER;
+    resolver $TEST_NGINX_RESOLVER ipv6=off;
     resolver_timeout 5s;
 
     location = /sub {