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diff --git a/feature-pooling-dmaap/src/test/java/org/onap/policy/drools/pooling/message/SupportMessageWithAssignmentsTester.java b/feature-pooling-dmaap/src/test/java/org/onap/policy/drools/pooling/message/SupportMessageWithAssignmentsTester.java
new file mode 100644
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+++ b/feature-pooling-dmaap/src/test/java/org/onap/policy/drools/pooling/message/SupportMessageWithAssignmentsTester.java
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+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.drools.pooling.message;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+
+/**
+ * Superclass used to test subclasses of {@link MessageWithAssignments}.
+ * 
+ * @param <T> type of {@link MessageWithAssignments} subclass that this tests
+ */
+public abstract class SupportMessageWithAssignmentsTester<T extends MessageWithAssignments>
+        extends SupportBasicMessageTester<T> {
+    // values set by makeValidMessage()
+    public static final String[] VALID_ARRAY = {VALID_HOST, VALID_HOST + "_xxx"};
+    public static final BucketAssignments VALID_ASGN = new BucketAssignments(VALID_ARRAY);
+
+    /**
+     * {@code True} if {@code null} assignments are allowed, {@code false}
+     * otherwise.
+     */
+    private boolean nullAssignments;
+
+    /**
+     * Constructor.
+     * 
+     * @param subclazz subclass of {@link MessageWithAssignments} being tested
+     */
+    public SupportMessageWithAssignmentsTester(Class<T> subclazz) {
+        super(subclazz);
+    }
+
+    /**
+     * Indicates whether or not {@code null} assignments should be used for the
+     * remaining tests.
+     * 
+     * @param nullAssignments {@code true} to use {@code null} assignments,
+     *        {@code false} otherwise
+     */
+    public void setNullAssignments(boolean nullAssignments) {
+        this.nullAssignments = nullAssignments;
+    }
+
+    public boolean isNullAssignments() {
+        return nullAssignments;
+    }
+
+    @Test
+    public void testCheckValidity_InvalidFields() throws Exception {
+        // null source (i.e., superclass field)
+        expectCheckValidityFailure(msg -> msg.setSource(null));
+
+        // empty assignments
+        expectCheckValidityFailure(msg -> msg.setAssignments(new BucketAssignments(new String[0])));
+
+        // invalid assignment
+        String[] invalidAssignment = {"abc", null};
+        expectCheckValidityFailure(msg -> msg.setAssignments(new BucketAssignments(invalidAssignment)));
+    }
+
+    @Test
+    public void testGetAssignments_testSetAssignments() {
+        MessageWithAssignments msg = makeValidMessage();
+
+        // from constructor
+        assertEquals(VALID_ASGN, msg.getAssignments());
+
+        BucketAssignments asgn = new BucketAssignments();
+        msg.setAssignments(asgn);
+        assertEquals(asgn, msg.getAssignments());
+    }
+
+    @Override
+    public void testDefaultConstructorFields(T msg) {
+        super.testDefaultConstructorFields(msg);
+
+        assertNull(msg.getAssignments());
+    }
+
+    @Override
+    public void testValidFields(T msg) {
+        super.testValidFields(msg);
+
+        if (nullAssignments) {
+            assertNull(msg.getAssignments());
+
+        } else {
+            assertEquals(VALID_ASGN, msg.getAssignments());
+        }
+    }
+
+}