Merge pull request #33 from libp2p/fix/100

test: connect each peer precisely once.

swarm_test.go

@@ -102,14 +102,12 @@ func connectSwarms(t *testing.T, ctx context.Context, swarms []*Swarm) {
 	}
 
 	log.Info("Connecting swarms simultaneously.")
-	for _, s1 := range swarms {
-		for _, s2 := range swarms {
-			if s2.local != s1.local { // don't connect to self.
+	for i, s1 := range swarms {
+		for _, s2 := range swarms[i+1:] {
 			wg.Add(1)
 			connect(s1, s2.LocalPeer(), s2.ListenAddresses()[0]) // try the first.
 		}
 	}
-	}
 	wg.Wait()
 
 	for _, s := range swarms {