Sneaked in test for covariant return type narrowing in a getter method

Issue: SPR-10995

spring-beans/src/test/java/org/springframework/tests/sample/beans/DerivedTestBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -71,6 +71,11 @@ public class DerivedTestBean extends TestBean implements Serializable, BeanNameA
 		setSpouse(new TestBean(name));
 	}
 
+	@Override
+	public TestBean getSpouse() {
+		return (TestBean) super.getSpouse();
+	}
+
 
 	public void initialize() {
 		this.initialized = true;