Fix race-test failure in network

network/network_test.go

@@ -337,8 +337,6 @@ func generateNetwork(name string, n int, t *testing.T, roles ...module.Role) []*
 		r := newTestReactor(fmt.Sprintf("%s_%d", name, i), nm, ProtoTestNetwork, t)
 		r.nt = nt
 		r.c = c
-		failIfError(t, r.nt.Listen(), "fail to listen", r.name)
-		failIfError(t, nm.Start(), "fail to start", r.name)
 		arr[i] = r
 	}
 	return arr
@@ -562,6 +560,12 @@ func baseNetwork(t *testing.T) (m map[string][]*testReactor, ch chan context.Con
 			}
 		}
 	}
+	for _, v := range m {
+		for _, r := range v {
+			failIfError(t, r.nt.Listen(), "fail to listen", r.name)
+			failIfError(t, r.nm.Start(), "fail to start", r.name)
+		}
+	}
 
 	connMap, maxD, err := waitConnection(ch, defaultConnectionLimit, n, 10*DefaultSeedPeriod)
 	t.Log(time.Now(), "max:", maxD, connMap)