BATCH-1543: fix OrderedComposite

spring-batch-core/src/test/java/org/springframework/batch/core/listener/OrderedCompositeTests.java

@@ -16,6 +16,7 @@
 package org.springframework.batch.core.listener;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 
 import java.util.Arrays;
 import java.util.Iterator;
@@ -40,6 +41,14 @@ public class OrderedCompositeTests {
 		assertEquals("2", iterator.next());
 	}
 
+	@Test
+	public void testSetSameObject() {
+		list.setItems(Arrays.asList(new Object[] { "1", "1" }));
+		Iterator<Object> iterator = list.iterator();
+		assertEquals("1", iterator.next());
+		assertFalse(iterator.hasNext());
+	}
+
 	@Test
 	public void testAdd() {
 		list.setItems(Arrays.asList((Object) "1"));
@@ -81,6 +90,25 @@ public class OrderedCompositeTests {
 		assertEquals("1", iterator.next());
 	}
 
+	@Test
+	public void testAddDuplicateOrdered() {
+		list.setItems(Arrays.asList((Object) "1"));
+		list.add(new Ordered() {
+			public int getOrder() {
+				return 1;
+			}
+		});
+		list.add(new Ordered() {
+			public int getOrder() {
+				return 1;
+			}
+		});
+		Iterator<Object> iterator = list.iterator();
+		assertEquals(1, ((Ordered) iterator.next()).getOrder());
+		assertEquals(1, ((Ordered) iterator.next()).getOrder());
+		assertEquals("1", iterator.next());
+	}
+
 	@Test
 	public void testAddAnnotationOrdered() {
 		list.add(new Ordered() {