swarm: codebase split from go-ethereum (#1405)

network/simulation/events_test.go

@@ -0,0 +1,107 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package simulation
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+)
+
+// TestPeerEvents creates simulation, adds two nodes,
+// register for peer events, connects nodes in a chain
+// and waits for the number of connection events to
+// be received.
+func TestPeerEvents(t *testing.T) {
+	sim := New(noopServiceFuncMap)
+	defer sim.Close()
+
+	_, err := sim.AddNodes(2)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	events := sim.PeerEvents(ctx, sim.NodeIDs())
+
+	// two nodes -> two connection events
+	expectedEventCount := 2
+
+	var wg sync.WaitGroup
+	wg.Add(expectedEventCount)
+
+	go func() {
+		for e := range events {
+			if e.Error != nil {
+				if e.Error == context.Canceled {
+					return
+				}
+				t.Error(e.Error)
+				continue
+			}
+			wg.Done()
+		}
+	}()
+
+	err = sim.Net.ConnectNodesChain(sim.NodeIDs())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	wg.Wait()
+}
+
+func TestPeerEventsTimeout(t *testing.T) {
+	sim := New(noopServiceFuncMap)
+	defer sim.Close()
+
+	_, err := sim.AddNodes(2)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
+	defer cancel()
+	events := sim.PeerEvents(ctx, sim.NodeIDs())
+
+	done := make(chan struct{})
+	errC := make(chan error)
+	go func() {
+		for e := range events {
+			if e.Error == context.Canceled {
+				return
+			}
+			if e.Error == context.DeadlineExceeded {
+				close(done)
+				return
+			} else {
+				errC <- e.Error
+			}
+		}
+	}()
+
+	select {
+	case <-time.After(time.Second):
+		t.Fatal("no context deadline received")
+	case err := <-errC:
+		t.Fatal(err)
+	case <-done:
+		// all good, context deadline detected
+	}
+}