Suppress some unused warnings in test cases

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

@@ -252,6 +252,7 @@ public class JobListenerFactoryBeanTests {
 
 	}
 
+	@SuppressWarnings("unused")
 	private class AnnotatedTestClass {
 
 		boolean beforeJobCalled = false;

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

@@ -392,6 +392,7 @@ public class StepListenerFactoryBeanTests {
 
 	}
 
+	@SuppressWarnings("unused")
 	private class ThreeStepExecutionListener implements StepExecutionListener {
 
 		int callcount = 0;
@@ -417,6 +418,7 @@ public class StepListenerFactoryBeanTests {
 
 	}
 
+	@SuppressWarnings("unused")
 	private class TestListener implements SkipListener<String, Integer> {
 
 		boolean beforeStepCalled = false;

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

@@ -71,6 +71,7 @@ public class StepListenerMethodInterceptorTests {
 		return invokerSet;
 	}
 	
+	@SuppressWarnings("unused")
 	private class TestClass{
 		
 		int method1Count = 0;
@@ -91,6 +92,7 @@ public class StepListenerMethodInterceptorTests {
 		}
 	}
 	
+	@SuppressWarnings("unused")
 	private class StubMethodInvocation implements MethodInvocation{
 
 		Method method;

spring-batch-core/src/test/java/org/springframework/batch/core/repository/dao/XStreamExecutionContextStringSerializerTests.java

@@ -69,6 +69,7 @@ public class XStreamExecutionContextStringSerializerTests {
 		}
 	}
 
+	@SuppressWarnings("unused")
 	private static class ComplexObject {
 		private String name;
 		private BigDecimal number;

spring-batch-core/src/test/java/org/springframework/batch/core/step/NonAbstractStepTests.java

@@ -71,6 +71,7 @@ public class NonAbstractStepTests {
 	 * Fills the events list when listener methods are called, prefixed with the
 	 * name of the listener.
 	 */
+	@SuppressWarnings("unused")
 	private class EventTrackingListener implements StepExecutionListener {
 
 		private String name;