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diff --git a/watchmaker/framework/src/java/test/org/uncommons/watchmaker/framework/operators/IntegerAdjuster.java b/watchmaker/framework/src/java/test/org/uncommons/watchmaker/framework/operators/IntegerAdjuster.java
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+++ b/watchmaker/framework/src/java/test/org/uncommons/watchmaker/framework/operators/IntegerAdjuster.java
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+//=============================================================================
+// Copyright 2006-2010 Daniel W. Dyer
+//
+// 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.
+//=============================================================================
+package org.uncommons.watchmaker.framework.operators;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import org.uncommons.watchmaker.framework.EvolutionaryOperator;
+
+/**
+ * Trivial test operator that mutates all integers by adding a fixed offset.
+ * @author Daniel Dyer
+ */
+public final class IntegerAdjuster implements EvolutionaryOperator<Integer>
+{
+    private final int adjustment;
+
+    public IntegerAdjuster(int adjustment)
+    {
+        this.adjustment = adjustment;
+    }
+
+    public List<Integer> apply(List<Integer> selectedCandidates, Random rng)
+    {
+        List<Integer> result = new ArrayList<Integer>(selectedCandidates.size());
+        for (Integer i : selectedCandidates)
+        {
+            result.add(i + adjustment);
+        }
+        return result;
+    }
+}