Add broadcast delegate tests for clustering

Author: fabricekabongo

clustering/broadcast_delegate_test.go

@@ -0,0 +1,86 @@
+package clustering
+
+import (
+	"testing"
+
+	"github.com/fabricekabongo/loggerhead/query"
+	"github.com/fabricekabongo/loggerhead/world"
+	"github.com/hashicorp/memberlist"
+)
+
+func TestBroadcastDelegateNodeMeta(t *testing.T) {
+	engine := query.NewWriteQueryEngine(world.NewWorld())
+	delegate := newBroadcastDelegate(engine, &memberlist.TransmitLimitedQueue{})
+
+	if data := delegate.NodeMeta(0); len(data) != 0 {
+		t.Fatalf("expected empty node meta, got %v", data)
+	}
+}
+
+func TestBroadcastDelegateNotifyMsgExecutesCommand(t *testing.T) {
+	w := world.NewWorld()
+	engine := query.NewWriteQueryEngine(w)
+	delegate := newBroadcastDelegate(engine, &memberlist.TransmitLimitedQueue{})
+
+	delegate.NotifyMsg([]byte("SAVE ns loc 1 2"))
+
+	location, ok := w.GetLocation("ns", "loc")
+	if !ok {
+		t.Fatalf("expected location to be saved")
+	}
+
+	if location.Lat() != 1 || location.Lon() != 2 {
+		t.Fatalf("unexpected location coordinates: %v", location)
+	}
+}
+
+func TestBroadcastDelegateGetBroadcasts(t *testing.T) {
+	broadcasts := &memberlist.TransmitLimitedQueue{NumNodes: func() int { return 1 }, RetransmitMult: 1}
+	broadcasts.QueueBroadcast(NewLocationBroadcast("SAVE ns loc 1 1"))
+
+	delegate := newBroadcastDelegate(query.NewWriteQueryEngine(world.NewWorld()), broadcasts)
+
+	got := delegate.GetBroadcasts(0, 1024)
+	if len(got) != 1 {
+		t.Fatalf("expected 1 broadcast, got %d", len(got))
+	}
+
+	if string(got[0]) != "SAVE ns loc 1 1" {
+		t.Fatalf("unexpected broadcast payload %q", string(got[0]))
+	}
+}
+
+func TestBroadcastDelegateLocalState(t *testing.T) {
+	w := world.NewWorld()
+	_ = w.Save("ns", "loc", 10, 20)
+
+	delegate := newBroadcastDelegate(query.NewWriteQueryEngine(w), &memberlist.TransmitLimitedQueue{})
+
+	if data := delegate.LocalState(false); len(data) != 0 {
+		t.Fatalf("expected empty state when join is false, got %v", data)
+	}
+
+	data := delegate.LocalState(true)
+	restored := world.NewWorldFromBytes(data)
+
+	loc, ok := restored.GetLocation("ns", "loc")
+	if !ok || loc.Lat() != 10 || loc.Lon() != 20 {
+		t.Fatalf("expected saved location after restoration, got %#v, present=%v", loc, ok)
+	}
+}
+
+func TestBroadcastDelegateMergeRemoteState(t *testing.T) {
+	remote := world.NewWorld()
+	_ = remote.Save("ns", "loc", 3, 4)
+	buf := remote.ToBytes()
+
+	local := world.NewWorld()
+	delegate := newBroadcastDelegate(query.NewWriteQueryEngine(local), &memberlist.TransmitLimitedQueue{})
+
+	delegate.MergeRemoteState(buf, true)
+
+	loc, ok := local.GetLocation("ns", "loc")
+	if !ok || loc.Lat() != 3 || loc.Lon() != 4 {
+		t.Fatalf("expected merged location, got %#v, present=%v", loc, ok)
+	}
+}