test(snapshot): test restart with snapshot

tests/functional/simple_snapshot_test.go

@@ -11,7 +11,7 @@ import (
 )
 
 // This test creates a single node and then set a value to it to trigger snapshot
-func TestSimpleSnapshot(t *testing.T) {
+func TestSnapshot(t *testing.T) {
 	procAttr := new(os.ProcAttr)
 	procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
 	args := []string{"etcd", "-name=node1", "-data-dir=/tmp/node1", "-snapshot=true", "-snapshot-count=500"}
@@ -93,3 +93,57 @@ func TestSimpleSnapshot(t *testing.T) {
 		t.Fatal("wrong name of snapshot :", snapshots[0].Name())
 	}
 }
+
+// TestSnapshotRestart tests etcd restarts with snapshot file
+func TestSnapshotRestart(t *testing.T) {
+	procAttr := new(os.ProcAttr)
+	procAttr.Files = []*os.File{nil, os.Stdout, os.Stderr}
+	args := []string{"etcd", "-name=node1", "-data-dir=/tmp/node1", "-snapshot=true", "-snapshot-count=500"}
+
+	process, err := os.StartProcess(EtcdBinPath, append(args, "-f"), procAttr)
+	if err != nil {
+		t.Fatal("start process failed:" + err.Error())
+	}
+
+	time.Sleep(time.Second)
+
+	c := etcd.NewClient(nil)
+
+	c.SyncCluster()
+	// issue first 501 commands
+	for i := 0; i < 501; i++ {
+		result, err := c.Set("foo", "bar", 100)
+		node := result.Node
+
+		if err != nil || node.Key != "/foo" || node.Value != "bar" || node.TTL < 95 {
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			t.Fatalf("Set failed with %s %s %v", node.Key, node.Value, node.TTL)
+		}
+	}
+
+	// wait for a snapshot interval
+	time.Sleep(3 * time.Second)
+
+	_, err = ioutil.ReadDir("/tmp/node1/snapshot")
+	if err != nil {
+		t.Fatal("list snapshot failed:" + err.Error())
+	}
+
+	process.Kill()
+
+	process, err = os.StartProcess(EtcdBinPath, args, procAttr)
+	if err != nil {
+		t.Fatal("start process failed:" + err.Error())
+	}
+	defer process.Kill()
+
+	time.Sleep(1 * time.Second)
+
+	_, err = c.Set("foo", "bar", 100)
+	if err != nil {
+		t.Fatal(err)
+	}
+}