From 305ceb9ddd59ce97a8810bd20b9df644a916e482 Mon Sep 17 00:00:00 2001
From: tangcong <tangcong506@gmail.com>
Date: Mon, 16 Mar 2020 10:23:26 +0800
Subject: [PATCH] etcdserver/cindex: add unit test

---
 etcdserver/cindex/cindex_test.go | 71 ++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 etcdserver/cindex/cindex_test.go

diff --git a/etcdserver/cindex/cindex_test.go b/etcdserver/cindex/cindex_test.go
new file mode 100644
index 000000000000..625adc59762d
--- /dev/null
+++ b/etcdserver/cindex/cindex_test.go
@@ -0,0 +1,71 @@
+// Copyright 2015 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 cindex
+
+import (
+	"go.etcd.io/etcd/mvcc/backend"
+	"math/rand"
+	"os"
+	"testing"
+	"time"
+)
+
+// TestConsistentIndex ensures that LoadConsistentIndex/Save/ConsistentIndex and backend.BatchTx can work well together.
+func TestConsistentIndex(t *testing.T) {
+
+	be, tmpPath := backend.NewTmpBackend(time.Microsecond, 10)
+	defer os.Remove(tmpPath)
+	ci := NewConsistentIndex()
+
+	tx := be.BatchTx()
+	if tx == nil {
+		t.Fatal("batch tx is nil")
+	}
+	tx.Lock()
+	tx.UnsafeCreateBucket(metaBucketName)
+	tx.Unlock()
+	be.ForceCommit()
+	ci.LoadConsistentIndex(be.BatchTx())
+	r := rand.Uint64()
+	ci.SetConsistentIndex(r)
+	index := ci.ConsistentIndex()
+	if index != r {
+		t.Errorf("expected %d,got %d", r, index)
+	}
+	ci.Save(be.BatchTx())
+	be.ForceCommit()
+
+	ci = NewConsistentIndex()
+	index = ci.LoadConsistentIndex(be.BatchTx())
+	if index != r {
+		t.Errorf("expected %d,got %d", r, index)
+	}
+	index = ci.ConsistentIndex()
+	if index != r {
+		t.Errorf("expected %d,got %d", r, index)
+	}
+	be.Close()
+
+	b := backend.NewDefaultBackend(tmpPath)
+	ci = NewConsistentIndex()
+	index = ci.LoadConsistentIndex(b.BatchTx())
+	if index != r {
+		t.Errorf("expected %d,got %d", r, index)
+	}
+	index = ci.ConsistentIndex()
+	if index != r {
+		t.Errorf("expected %d,got %d", r, index)
+	}
+}