From 5cf6ba48de350a9d223168ff1ddd3a348ac70526 Mon Sep 17 00:00:00 2001
From: ahrtr <wachao@vmware.com>
Date: Tue, 8 Mar 2022 09:38:23 +0800
Subject: [PATCH] added a unit test for the method processMessages

---
 contrib/raftexample/raft_test.go | 129 +++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 contrib/raftexample/raft_test.go

diff --git a/contrib/raftexample/raft_test.go b/contrib/raftexample/raft_test.go
new file mode 100644
index 000000000..53d9ad2f7
--- /dev/null
+++ b/contrib/raftexample/raft_test.go
@@ -0,0 +1,129 @@
+// Copyright 2022 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"go.etcd.io/etcd/raft/v3/raftpb"
+	"reflect"
+	"testing"
+)
+
+func TestProcessMessages(t *testing.T) {
+	cases := []struct {
+		name             string
+		confState        raftpb.ConfState
+		InputMessages    []raftpb.Message
+		ExpectedMessages []raftpb.Message
+	}{
+		{
+			name: "only one snapshot message",
+			confState: raftpb.ConfState{
+				Voters: []uint64{2, 6, 8, 10},
+			},
+			InputMessages: []raftpb.Message{
+				{
+					Type: raftpb.MsgSnap,
+					To:   8,
+					Snapshot: raftpb.Snapshot{
+						Metadata: raftpb.SnapshotMetadata{
+							Index: 100,
+							Term:  3,
+							ConfState: raftpb.ConfState{
+								Voters:    []uint64{2, 6, 8},
+								AutoLeave: true,
+							},
+						},
+					},
+				},
+			},
+			ExpectedMessages: []raftpb.Message{
+				{
+					Type: raftpb.MsgSnap,
+					To:   8,
+					Snapshot: raftpb.Snapshot{
+						Metadata: raftpb.SnapshotMetadata{
+							Index: 100,
+							Term:  3,
+							ConfState: raftpb.ConfState{
+								Voters: []uint64{2, 6, 8, 10},
+							},
+						},
+					},
+				},
+			},
+		},
+		{
+			name: "one snapshot message and one other message",
+			confState: raftpb.ConfState{
+				Voters: []uint64{2, 7, 8, 12},
+			},
+			InputMessages: []raftpb.Message{
+				{
+					Type: raftpb.MsgSnap,
+					To:   8,
+					Snapshot: raftpb.Snapshot{
+						Metadata: raftpb.SnapshotMetadata{
+							Index: 100,
+							Term:  3,
+							ConfState: raftpb.ConfState{
+								Voters:    []uint64{2, 6, 8},
+								AutoLeave: true,
+							},
+						},
+					},
+				},
+				{
+					Type: raftpb.MsgApp,
+					From: 6,
+					To:   8,
+				},
+			},
+			ExpectedMessages: []raftpb.Message{
+				{
+					Type: raftpb.MsgSnap,
+					To:   8,
+					Snapshot: raftpb.Snapshot{
+						Metadata: raftpb.SnapshotMetadata{
+							Index: 100,
+							Term:  3,
+							ConfState: raftpb.ConfState{
+								Voters: []uint64{2, 7, 8, 12},
+							},
+						},
+					},
+				},
+				{
+					Type: raftpb.MsgApp,
+					From: 6,
+					To:   8,
+				},
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			rn := &raftNode{
+				confState: tc.confState,
+			}
+
+			outputMessages := rn.processMessages(tc.InputMessages)
+
+			if !reflect.DeepEqual(outputMessages, tc.ExpectedMessages) {
+				t.Fatalf("Unexpected messages, expected: %v, got %v", tc.ExpectedMessages, outputMessages)
+			}
+		})
+	}
+}