added one test method

src/main/java/teetime/stage/basic/merger/Merger.java

@@ -59,7 +59,6 @@ public final class Merger<T> extends AbstractStage {
 		if (token == null) {
 			returnNoElement();
 		}
-
 		outputPort.send(token);
 	}
 

wiki @ 63ccbbc8

-Subproject commit 0e4474577e1f49bc96e734c286b2d9e0363895e8
+Subproject commit 63ccbbc87bd2c0e6599ca91502149dba3cfb99de

src/test/java/teetime/stage/basic/merger/MergerTest.java

@@ -16,13 +16,20 @@
 package teetime.stage.basic.merger;
 
 import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.Matchers.empty;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.not;
 import static org.junit.Assert.assertThat;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.junit.Before;
 import org.junit.Test;
 
 import teetime.framework.pipe.IPipeFactory;
 import teetime.framework.pipe.SingleElementPipeFactory;
+import teetime.framework.test.StageTester;
 import teetime.stage.CollectorSink;
 import teetime.stage.InitialElementProducer;
 
@@ -72,4 +79,17 @@ public class MergerTest {
 		assertThat(this.collector.getElements(), contains(1, 2, 3));
 	}
 
+	@Test
+	public void roundRobinShouldWork2() {
+		mergerUnderTest = new Merger<Integer>();
+		mergerUnderTest.setStrategy(new RoundRobinStrategy());
+
+		List<Integer> outputList = new ArrayList<Integer>();
+		StageTester.test(mergerUnderTest).and().send(1, 2, 3).to(mergerUnderTest.getNewInputPort())
+				.and().send(4, 5, 6).to(mergerUnderTest.getNewInputPort())
+				.and().receive(outputList);
+
+		assertThat(outputList, is(not(empty())));
+		assertThat(outputList, contains(1, 2, 3, 4, 5, 6));
+	}
 }