tests: add test for multiple ips in "trust proxy"

test/req.ip.js

@@ -21,7 +21,7 @@ describe('req', function(){
           .expect('client', done);
         })
 
-        it('should return the addr after trusted proxy', function(done){
+        it('should return the addr after trusted proxy based on count', function (done) {
           var app = express();
 
           app.set('trust proxy', 2);
@@ -36,6 +36,21 @@ describe('req', function(){
           .expect('p1', done);
         })
 
+        it('should return the addr after trusted proxy based on list', function (done) {
+          var app = express()
+
+          app.set('trust proxy', '10.0.0.1, 10.0.0.2, 127.0.0.1, ::1')
+
+          app.get('/', function (req, res) {
+            res.send(req.ip)
+          })
+
+          request(app)
+            .get('/')
+            .set('X-Forwarded-For', '10.0.0.2, 10.0.0.3, 10.0.0.1', '10.0.0.4')
+            .expect('10.0.0.3', done)
+        })
+
         it('should return the addr after trusted proxy, from sub app', function (done) {
           var app = express();
           var sub = express();