From ed266f51a70be2352dc424972e50ff4250c00eff Mon Sep 17 00:00:00 2001
From: Johnathan Howell <me@johnathanhowell.com>
Date: Mon, 19 Sep 2016 18:47:03 -0400
Subject: [PATCH] add TestConcurrentUPNP

---
 upnp_test.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/upnp_test.go b/upnp_test.go
index 8634075..c135d92 100644
--- a/upnp_test.go
+++ b/upnp_test.go
@@ -4,6 +4,26 @@ import (
 	"testing"
 )
 
+// TestConcurrentUPNP tests that several threads calling Discover() concurrently
+// succeed.
+func TestConcurrentUPNP(t *testing.T) {
+	// verify that a router exists
+	_, err := Discover()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// now try to concurrently Discover() using 10 threads
+	for i := 0; i < 10; i++ {
+		go func() {
+			_, err := Discover()
+			if err != nil {
+				t.Fatal(err)
+			}
+		}()
+	}
+}
+
 func TestIGD(t *testing.T) {
 	// connect to router
 	d, err := Discover()