Add ASF license header to reproduce_issue_test.go

Author: Kaustubh1204

store/reproduce_issue_test.go

@@ -0,0 +1,53 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 store
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestCluster_PromoteNewMaster_SequenceZero(t *testing.T) {
+	shard := NewShard()
+	shard.SlotRanges = []SlotRange{{Start: 0, Stop: 1023}}
+
+	node0 := NewClusterMockNode()
+	node0.SetRole(RoleMaster)
+	node0.Sequence = 100 // Master has non-zero sequence
+
+	node1 := NewClusterMockNode()
+	node1.SetRole(RoleSlave)
+	node1.Sequence = 0 // Slave has zero sequence
+
+	shard.Nodes = []Node{node0, node1}
+	cluster := &Cluster{
+		Shards: Shards{shard},
+	}
+
+	ctx := context.Background()
+
+	// Try to promote node1 (sequence 0) when master has sequence 100
+	// This currently fails because of the check in getNewMasterNodeIndex
+	// We want this to succeed (or determine if it should).
+	// Based on the task "handle sequence zero", we likely want to allow this.
+	newMasterID, err := cluster.PromoteNewMaster(ctx, 0, node1.ID(), "")
+	require.NoError(t, err, "PromoteNewMaster should succeed even if sequence is 0")
+	require.Equal(t, node1.ID(), newMasterID)
+}