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diff --git a/watchmaker/examples/src/java/test/org/uncommons/watchmaker/examples/monalisa/RemovePolygonMutationTest.java b/watchmaker/examples/src/java/test/org/uncommons/watchmaker/examples/monalisa/RemovePolygonMutationTest.java
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+++ b/watchmaker/examples/src/java/test/org/uncommons/watchmaker/examples/monalisa/RemovePolygonMutationTest.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.examples.monalisa;
+
+import java.awt.Dimension;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import org.testng.annotations.Test;
+import org.uncommons.maths.random.Probability;
+import org.uncommons.watchmaker.examples.ExamplesTestUtils;
+import org.uncommons.watchmaker.framework.EvolutionaryOperator;
+
+/**
+ * Unit test for the {@link RemovePolygonMutation} evolutionary operator.
+ * @author Daniel Dyer
+ */
+public class RemovePolygonMutationTest
+{
+    private final PolygonImageFactory factory = new PolygonImageFactory(new Dimension(200, 200));
+
+    @Test
+    public void testRemovePolygon()
+    {
+        List<ColouredPolygon> image = Arrays.asList(factory.createRandomPolygon(ExamplesTestUtils.getRNG()),
+                                                    factory.createRandomPolygon(ExamplesTestUtils.getRNG()),
+                                                    factory.createRandomPolygon(ExamplesTestUtils.getRNG()),
+                                                    factory.createRandomPolygon(ExamplesTestUtils.getRNG()));
+        List<List<ColouredPolygon>> list = new ArrayList<List<ColouredPolygon>>(1);
+        list.add(image);
+
+        EvolutionaryOperator<List<ColouredPolygon>> mutation = new RemovePolygonMutation(Probability.ONE);
+
+        List<List<ColouredPolygon>> evolved = mutation.apply(list, ExamplesTestUtils.getRNG());
+        assert evolved.size() == 1 : "Population size should not be altered by mutation.";
+        assert evolved.get(0).size() == image.size() - 1 : "Image should have 1 fewer polygon after mutation.";
+    }
+
+
+    @Test
+    public void testZeroProbability()
+    {
+        List<ColouredPolygon> image = Arrays.asList(factory.createRandomPolygon(ExamplesTestUtils.getRNG()),
+                                                    factory.createRandomPolygon(ExamplesTestUtils.getRNG()),
+                                                    factory.createRandomPolygon(ExamplesTestUtils.getRNG()),
+                                                    factory.createRandomPolygon(ExamplesTestUtils.getRNG()));
+        List<List<ColouredPolygon>> list = new ArrayList<List<ColouredPolygon>>(1);
+        list.add(image);
+
+        EvolutionaryOperator<List<ColouredPolygon>> mutation = new RemovePolygonMutation(Probability.ZERO);
+
+        List<List<ColouredPolygon>> evolved = mutation.apply(list, ExamplesTestUtils.getRNG());
+        assert evolved.size() == 1 : "Population size should not be altered by mutation.";
+        assert evolved.get(0).size() == image.size() : "Image should have same number of polygons.";
+        assert evolved.get(0) == image : "Image should not have been changed at all.";
+    }
+
+
+    /**
+     * If the image already has the minimum permitted number of polygons, further polygons
+     * should not be removed by mutation.
+     */
+    @Test
+    public void testRemoveMinPolygons()
+    {
+        List<ColouredPolygon> image = factory.generateRandomCandidate(ExamplesTestUtils.getRNG());
+        assert image.size() == 2 : "Image should have 2 polygons";
+        List<List<ColouredPolygon>> list = new ArrayList<List<ColouredPolygon>>(1);
+        list.add(image);
+
+        EvolutionaryOperator<List<ColouredPolygon>> mutation = new RemovePolygonMutation(Probability.ONE);
+
+        List<List<ColouredPolygon>> evolved = mutation.apply(list, ExamplesTestUtils.getRNG());
+        assert evolved.size() == 1 : "Population size should not be altered by mutation.";
+        assert evolved.get(0).size() == image.size() : "Image should have no fewer than the minimum number of polygons.";
+        assert evolved.get(0) == image : "Image should not have been changed at all.";
+    }
+}