A very simple test case to reproduce a bug where one is not able to use the selectRandomly selector

jsprit-core/src/test/java/jsprit/core/algorithm/SelectRandomlyTest.java

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+package jsprit.core.algorithm;
+
+import jsprit.core.algorithm.io.VehicleRoutingAlgorithms;
+import jsprit.core.problem.VehicleRoutingProblem;
+import jsprit.core.problem.io.VrpXMLReader;
+import org.junit.Test;
+
+import static org.junit.Assert.fail;
+
+public class SelectRandomlyTest {
+
+	@Test
+	public void loadAnAlgorithmWithSelectRandomly() {
+		VehicleRoutingProblem.Builder vrpBuilder = VehicleRoutingProblem.Builder.newInstance();
+		new VrpXMLReader(vrpBuilder).read("src/test/resources/simpleProblem.xml");
+		VehicleRoutingProblem vrp = vrpBuilder.build();
+		try {
+			VehicleRoutingAlgorithms.readAndCreateAlgorithm(vrp, "src/test/resources/algorithmConfig_selectRandomly.xml");
+		} catch (Exception e) {
+			e.printStackTrace();
+			fail("Should be able to load an algorithm that uses <selector name=\"selectRandomly\"/>: " + e.getMessage());
+		}
+	}
+}

jsprit-core/src/test/resources/algorithmConfig_selectRandomly.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Copyright (C) 2013  Stefan Schroeder
+  
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License
+  as published by the Free Software Foundation; either version 2
+  of the License, or (at your option) any later version.
+  
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+  
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+  
+  Contributors:
+      Stefan Schroeder - initial API and implementation
+-->
+<algorithm xmlns="http://www.w3schools.com"
+		   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		   xsi:schemaLocation="http://www.w3schools.com algorithm_schema.xsd">
+
+	<iterations>2000</iterations>
+
+	<construction>
+		<insertion name="bestInsertion"/>
+	</construction>
+
+	<strategy>
+
+		<memory>1</memory>
+
+		<searchStrategies>
+			<searchStrategy name="selectRandomlyRandomRuinAndRecreate">
+				<selector name="selectRandomly"/>
+				<acceptor name="acceptNewRemoveWorst"/>
+				<modules>
+					<module name="ruin_and_recreate">
+						<ruin name="randomRuin">
+							<share>0.5</share>
+						</ruin>
+						<insertion name="bestInsertion"/>
+					</module>
+				</modules>
+				<probability>1</probability>
+			</searchStrategy>
+		</searchStrategies>
+		
+	</strategy>
+
+</algorithm>