add ipv6 unit test

Author: vislee

t/ipdb.t

@@ -59,6 +59,10 @@ http {
  return 200 $ipdb_country_name;
  }
 
+ location /ipv6/country/ {
+ return 200 null$ipdb_country_name;
+ }
+
  location /region/ {
  return 200 $ipdb_region_name;
  }
@@ -76,7 +80,7 @@ http {
 
 EOF
 
-$t->try_run('no ipdb')->plan(7);
+$t->try_run('no ipdb')->plan(8);
 
 ###############################################################################
 like(http(<<EOF), qr/testipdb/, 'ipdb test');
@@ -94,6 +98,14 @@ X-Forwarded-For: 36.102.4.81,192.168.0.1
 EOF
 
 
+like(http(<<EOF), qr/null$/, 'ipdb country');
+GET /ipv6/country/ HTTP/1.0
+Host: localhost
+X-Forwarded-For: a80::7cfc:c767:aded:c04e
+
+EOF
+
+
 like(http(<<EOF), qr/局域网/, 'ipdb country proxy');
 GET /country/ HTTP/1.0
 Host: localhost