From df5426dd8b8c7905d08688463751c6fabb2bc561 Mon Sep 17 00:00:00 2001
From: Bryan Boreham <bjboreham@gmail.com>
Date: Thu, 20 Aug 2015 11:57:56 +0100
Subject: [PATCH] Check if we have any peers with entries, to avoid crash

---
 ipam/ring/ring_test.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ipam/ring/ring_test.go b/ipam/ring/ring_test.go
index c9ab789b..f25de566 100644
--- a/ipam/ring/ring_test.go
+++ b/ipam/ring/ring_test.go
@@ -709,6 +709,9 @@ func TestFuzzRingHard(t *testing.T) {
 				ringsWithEntries = append(ringsWithEntries, ring)
 			}
 		}
+		if len(ringsWithEntries) == 0 { // no rings have entries.
+			return
+		}
 		ring1 := ringsWithEntries[rand.Intn(len(ringsWithEntries))]
 		ring2index, _, ring2 := randomPeer(-1)
 		common.Log.Debugf("%s: 'Gossiping' to %s", ring1.Peer, ring2.Peer)