Fix test class name and protect debug log message

spring-messaging/src/main/java/org/springframework/messaging/support/AbstractMessageChannel.java

@@ -147,7 +147,9 @@ public abstract class AbstractMessageChannel implements MessageChannel, BeanName
 				message = interceptor.preSend(message, channel);
 				if (message == null) {
 					String name = interceptor.getClass().getSimpleName();
-					logger.debug(name + " returned null from preSend, i.e. precluding the send.");
+					if (logger.isDebugEnabled()) {
+						logger.debug(name + " returned null from preSend, i.e. precluding the send.");
+					}
 					triggerAfterSendCompletion(message, channel, false, null);
 					return null;
 				}

spring-messaging/src/test/java/org/springframework/messaging/support/ExecutorSubscribableChannelTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -28,19 +28,17 @@ import org.springframework.core.task.TaskExecutor;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.MessageDeliveryException;
 import org.springframework.messaging.MessageHandler;
-import org.springframework.messaging.MessagingException;
-import org.springframework.messaging.support.MessageBuilder;
 
 import static org.hamcrest.Matchers.*;
 import static org.junit.Assert.*;
 import static org.mockito.BDDMockito.*;
 
 /**
- * Tests for {@link ExecutorSubscribableChannel}.
+ * Unit tests for {@link ExecutorSubscribableChannel}.
  *
  * @author Phillip Webb
  */
-public class PublishSubscribeChannelTests {
+public class ExecutorSubscribableChannelTests {
 
 	@Rule
 	public ExpectedException thrown = ExpectedException.none();
@@ -117,20 +115,14 @@ public class PublishSubscribeChannelTests {
 			this.channel.send(message);
 		}
 		catch (MessageDeliveryException actualException) {
-			assertThat((RuntimeException) actualException.getCause(), equalTo(ex));
+			assertThat(actualException.getCause(), equalTo(ex));
 		}
 		verifyZeroInteractions(secondHandler);
 	}
 
 	@Test
 	public void concurrentModification() throws Exception {
-		this.channel.subscribe(new MessageHandler() {
-
-			@Override
-			public void handleMessage(Message<?> message) throws MessagingException {
-				channel.unsubscribe(handler);
-			}
-		});
+		this.channel.subscribe(message1 -> channel.unsubscribe(handler));
 		this.channel.subscribe(this.handler);
 		this.channel.send(this.message);
 		verify(this.handler).handleMessage(this.message);