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diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/OperationCompleterTest.java b/opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/OperationCompleterTest.java
new file mode 100644
index 0000000000..e7afe262b9
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+++ b/opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/OperationCompleterTest.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2015 Brocade Communications Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.datastore;
+
+import static org.junit.Assert.assertEquals;
+import java.util.concurrent.Semaphore;
+import org.junit.Test;
+import org.opendaylight.controller.cluster.datastore.messages.BatchedModificationsReply;
+import org.opendaylight.controller.cluster.datastore.messages.DataExistsReply;
+
+/**
+ * Unit tests for OperationCompleter.
+ *
+ * @author Thomas Pantelis
+ */
+public class OperationCompleterTest {
+
+    @Test
+    public void testOnComplete() throws Exception {
+        int permits = 10;
+        Semaphore operationLimiter = new Semaphore(permits);
+        operationLimiter.acquire(permits);
+        int availablePermits = 0;
+
+        OperationCompleter completer = new OperationCompleter(operationLimiter );
+
+        completer.onComplete(null, new DataExistsReply(true));
+        assertEquals("availablePermits", ++availablePermits, operationLimiter.availablePermits());
+
+        completer.onComplete(null, new DataExistsReply(true));
+        assertEquals("availablePermits", ++availablePermits, operationLimiter.availablePermits());
+
+        completer.onComplete(null, new IllegalArgumentException());
+        assertEquals("availablePermits", ++availablePermits, operationLimiter.availablePermits());
+
+        completer.onComplete(null, new BatchedModificationsReply(4));
+        availablePermits += 4;
+        assertEquals("availablePermits", availablePermits, operationLimiter.availablePermits());
+    }
+}