fix: server_test.go

server/etcdserver/server_test.go

@@ -99,8 +99,12 @@ func TestApplyRepeat(t *testing.T) {
 		SyncTicker:   &time.Ticker{},
 		consistIndex: cindex.NewFakeConsistentIndex(0),
 		uberApply:    uberApplierMock{},
+		kv:           mvcc.New(zaptest.NewLogger(t), be, &lease.FakeLessor{}, mvcc.StoreConfig{}),
 	}
 	s.start()
+
+	n.readyc <- newDummyPutReqReady()
+
 	req := &pb.InternalRaftRequest{
 		Header: &pb.RequestHeader{ID: 1},
 		Put:    &pb.PutRequest{Key: []byte("foo"), Value: []byte("bar")},
@@ -885,8 +889,12 @@ func TestAddMember(t *testing.T) {
 		SyncTicker:   &time.Ticker{},
 		consistIndex: cindex.NewFakeConsistentIndex(0),
 		beHooks:      serverstorage.NewBackendHooks(lg, nil),
+		kv:           mvcc.New(zaptest.NewLogger(t), be, &lease.FakeLessor{}, mvcc.StoreConfig{}),
 	}
 	s.start()
+
+	n.readyc <- newDummyPutReqReady()
+
 	m := membership.Member{ID: 1234, RaftAttributes: membership.RaftAttributes{PeerURLs: []string{"foo"}}}
 	_, err := s.AddMember(context.Background(), m)
 	gaction := n.Action()
@@ -992,8 +1000,12 @@ func TestRemoveMember(t *testing.T) {
 		SyncTicker:   &time.Ticker{},
 		consistIndex: cindex.NewFakeConsistentIndex(0),
 		beHooks:      serverstorage.NewBackendHooks(lg, nil),
+		kv:           mvcc.New(zaptest.NewLogger(t), be, &lease.FakeLessor{}, mvcc.StoreConfig{}),
 	}
 	s.start()
+
+	n.readyc <- newDummyPutReqReady()
+
 	_, err := s.RemoveMember(context.Background(), 1234)
 	gaction := n.Action()
 	s.Stop()
@@ -1041,8 +1053,12 @@ func TestUpdateMember(t *testing.T) {
 		SyncTicker:   &time.Ticker{},
 		consistIndex: cindex.NewFakeConsistentIndex(0),
 		beHooks:      serverstorage.NewBackendHooks(lg, nil),
+		kv:           mvcc.New(zaptest.NewLogger(t), be, &lease.FakeLessor{}, mvcc.StoreConfig{}),
 	}
 	s.start()
+
+	n.readyc <- newDummyPutReqReady()
+
 	wm := membership.Member{ID: 1234, RaftAttributes: membership.RaftAttributes{PeerURLs: []string{"http://127.0.0.1:1"}}}
 	_, err := s.UpdateMember(context.Background(), wm)
 	gaction := n.Action()
@@ -1581,3 +1597,18 @@ func TestIsActive(t *testing.T) {
 		require.Equal(t, tc.expectActive, s.isActive())
 	}
 }
+
+// newDummyPutReqReady creates a dummy raft.Ready.
+//
+// In unit tests, EtcdServer doesn't append raft log entries upon start like the full-featured etcd does.
+// This can crash the program when creating a raft log snapshot due to no available entries.
+// To append raft log entries, we can send a newDummyPutReqReady() to raft.Node's readyc after the server starts.
+func newDummyPutReqReady() raft.Ready {
+	req := &pb.InternalRaftRequest{
+		Header: &pb.RequestHeader{ID: 1},
+		Put:    &pb.PutRequest{Key: []byte("newDummyPutReqReady"), Value: []byte("bar")},
+	}
+	ents := []raftpb.Entry{{Index: 1, Data: pbutil.MustMarshal(req)}}
+
+	return raft.Ready{Entries: ents}
+}