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diff --git a/watchmaker/framework/src/java/test/org/uncommons/watchmaker/framework/operators/ListOperatorTest.java b/watchmaker/framework/src/java/test/org/uncommons/watchmaker/framework/operators/ListOperatorTest.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.Arrays;
+import java.util.List;
+import org.testng.annotations.Test;
+import org.uncommons.watchmaker.framework.FrameworkTestUtils;
+
+/**
+ * Unit test for the {@link ListOperator} high-order evolutionary operator.
+ * @author Daniel Dyer
+ */
+public class ListOperatorTest
+{
+    /**
+     * Make sure that the delegate operator is applied to each list in the
+     * population.
+     */
+    @Test
+    public void testApplication()
+    {
+        ListOperator<Integer> operator = new ListOperator<Integer>(new IntegerAdjuster(1));
+        List<List<Integer>> selection = new ArrayList<List<Integer>>(3);
+        selection.add(Arrays.asList(1, 2, 3));
+        selection.add(Arrays.asList(4, 5, 6));
+        selection.add(Arrays.asList(7, 8, 9));
+
+        List<List<Integer>> mutations = operator.apply(selection, FrameworkTestUtils.getRNG());
+        assert mutations.size() == 3 : "Wrong number of candidates after list operation: " + selection.size();
+
+        // Each element in each candidate list should have been incremented by the delegate operator.
+        for (int i = 0; i < selection.size(); i++)
+        {
+            List<Integer> original = selection.get(i);
+            List<Integer> mutation = mutations.get(i);
+            assert original.size() == mutation.size() : "Mutation size mismatch: " + mutation.size();
+            for (int j = 0; j < original.size(); j++)
+            {
+                assert mutation.get(j) == original.get(j) + 1 : "List value not mutated correctly."; 
+            }
+        }
+    }
+}