OAK-4131: LastRevisionRecoveryAgent may throw ClassCastException

Add test

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1735484 13f79535-47bb-0310-9956-ffa450edef68

oak-core/src/test/java/org/apache/jackrabbit/oak/plugins/document/mongo/AcquireRecoveryLockTest.java

@@ -0,0 +1,49 @@
+/*
+ * 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 org.apache.jackrabbit.oak.plugins.document.mongo;
+
+import java.util.List;
+
+import org.apache.jackrabbit.oak.plugins.document.AbstractMongoConnectionTest;
+import org.apache.jackrabbit.oak.plugins.document.ClusterNodeInfo;
+import org.apache.jackrabbit.oak.plugins.document.ClusterNodeInfoDocument;
+import org.apache.jackrabbit.oak.plugins.document.DocumentMK;
+import org.junit.Test;
+
+import static com.google.common.collect.Lists.newArrayList;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+public class AcquireRecoveryLockTest extends AbstractMongoConnectionTest {
+
+    // OAK-4131
+    @Test
+    public void recoveryBy() throws Exception {
+        MongoDocumentStore store = new MongoDocumentStore(
+                mongoConnection.getDB(), new DocumentMK.Builder());
+        MongoMissingLastRevSeeker seeker = new MongoMissingLastRevSeeker(store);
+        List<ClusterNodeInfoDocument> infoDocs = newArrayList(seeker.getAllClusters());
+        assertEquals(1, infoDocs.size());
+        int clusterId = infoDocs.get(0).getClusterId();
+        int otherClusterId = clusterId + 1;
+        seeker.acquireRecoveryLock(clusterId, otherClusterId);
+        ClusterNodeInfoDocument doc = seeker.getClusterNodeInfo(clusterId);
+        Object recoveryBy = doc.get(ClusterNodeInfo.REV_RECOVERY_BY);
+        assertNotNull(recoveryBy);
+        assertEquals(Long.class, recoveryBy.getClass());
+    }
+}