From 42ddc42c075b0ca2e0a1b22bc95401ad569b7812 Mon Sep 17 00:00:00 2001
From: Valeri Karpov <val@karpov.io>
Date: Thu, 26 Jul 2018 18:17:24 -0400
Subject: [PATCH] test(connection): repro #6756

---
 test/connection.test.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/test/connection.test.js b/test/connection.test.js
index d01bbd1ec70..4bc969c8fd7 100644
--- a/test/connection.test.js
+++ b/test/connection.test.js
@@ -56,6 +56,13 @@ describe('connections:', function() {
       }).catch(done);
     });
 
+    it('throws helpful error with legacy syntax (gh-6756)', function(done) {
+      assert.throws(function() {
+        mongoose.createConnection('localhost', 'dbname', 27017);
+      }, /mongoosejs\.com.*connections\.html/);
+      done();
+    });
+
     it('resolving with q (gh-5714)', function(done) {
       var bootMongo = Q.defer();