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diff --git a/upstream/odl-aaa-moon/aaa/aaa-shiro/src/test/java/org/opendaylight/aaa/shiro/TestAppender.java b/upstream/odl-aaa-moon/aaa/aaa-shiro/src/test/java/org/opendaylight/aaa/shiro/TestAppender.java
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+++ b/upstream/odl-aaa-moon/aaa/aaa-shiro/src/test/java/org/opendaylight/aaa/shiro/TestAppender.java
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+/*
+ * Copyright (c) 2016 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.aaa.shiro;
+
+import ch.qos.logback.classic.spi.LoggingEvent;
+import ch.qos.logback.core.AppenderBase;
+
+import java.util.List;
+import java.util.Vector;
+
+/**
+ * A custom slf4j <code>Appender</code> which stores <code>LoggingEvent</code>(s) in memory
+ * for future retrieval.  This is useful from inside test resources.  This class is specified
+ * within <code>logback-test.xml</code>.
+ *
+ * @author Ryan Goulding (ryandgoulding@gmail.com)
+ */
+public class TestAppender extends AppenderBase<LoggingEvent> {
+
+    /**
+     * stores all log events in memory, instead of file
+     */
+    private List<LoggingEvent> events = new Vector<>();
+
+    /**
+     * Since junit maven & junit instantiate the logging appender (as provided
+     * by logback-test.xml), singleton is not possible.  The next best thing is to track the
+     * current instance so it can be retrieved by Test instances.
+     */
+    private static volatile TestAppender currentInstance;
+
+    /**
+     * keeps track of the current instance
+     */
+    public TestAppender() {
+        currentInstance = this;
+    }
+
+    @Override
+    protected void append(final LoggingEvent e) {
+        events.add(e);
+    }
+
+    /**
+     * Extract the log.
+     *
+     * @return the in-memory representation of <code>LoggingEvent</code>(s)
+     */
+    public List<LoggingEvent> getEvents() {
+        return events;
+    }
+
+    /**
+     * A way to extract the appender from Test instances.
+     *
+     * @return <code>this</code>
+     */
+    public static TestAppender getCurrentInstance() {
+        return currentInstance;
+    }
+}