Consistent whitespace after imports

Update code to have a consistent number of new-line characters after
import statements.

spring-websocket/src/test/java/org/springframework/web/socket/AbstractWebSocketIntegrationTests.java

@@ -34,7 +34,6 @@ import org.springframework.web.socket.server.RequestUpgradeStrategy;
 import org.springframework.web.socket.server.support.JettyRequestUpgradeStrategy;
 import org.springframework.web.socket.server.support.TomcatRequestUpgradeStrategy;
 
-
 /**
  * Base class for WebSocket integration tests.
  *

spring-websocket/src/test/java/org/springframework/web/socket/JettyWebSocketTestServer.java

@@ -23,7 +23,6 @@ import org.springframework.util.SocketUtils;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.servlet.DispatcherServlet;
 
-
 /**
  * Jetty based {@link WebSocketTestServer}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/TomcatWebSocketTestServer.java

@@ -29,7 +29,6 @@ import org.springframework.util.SocketUtils;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.servlet.DispatcherServlet;
 
-
 /**
  * Tomcat based {@link WebSocketTestServer}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/client/jetty/JettyWebSocketClientTests.java

@@ -39,7 +39,6 @@ import org.springframework.web.socket.support.WebSocketHttpHeaders;
 
 import static org.junit.Assert.*;
 
-
 /**
  * Tests for {@link JettyWebSocketClient}.
  * @author Rossen Stoyanchev

spring-websocket/src/test/java/org/springframework/web/socket/messaging/SimpAnnotationMethodIntegrationTests.java

@@ -58,7 +58,6 @@ import org.springframework.web.socket.server.HandshakeHandler;
 import static org.junit.Assert.*;
 import static org.springframework.web.socket.messaging.StompTextMessageBuilder.*;
 
-
 /**
  * Integration tests with annotated message-handling methods.
  * @author Rossen Stoyanchev

spring-websocket/src/test/java/org/springframework/web/socket/messaging/StompTextMessageBuilder.java

@@ -23,7 +23,6 @@ import java.util.List;
 import org.springframework.messaging.simp.stomp.StompCommand;
 import org.springframework.web.socket.TextMessage;
 
-
 /**
  * A builder for creating WebSocket messages with STOMP frame content.
  *

spring-websocket/src/test/java/org/springframework/web/socket/messaging/SubProtocolWebSocketHandlerTests.java

@@ -27,7 +27,6 @@ import org.springframework.web.socket.support.TestWebSocketSession;
 
 import static org.mockito.Mockito.*;
 
-
 /**
  * Test fixture for {@link SubProtocolWebSocketHandler}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/messaging/config/WebMvcStompEndpointRegistrationTests.java

@@ -37,7 +37,6 @@ import org.springframework.web.socket.sockjs.transport.handler.WebSocketTranspor
 
 import static org.junit.Assert.*;
 
-
 /**
  * Test fixture for {@link WebMvcStompWebSocketEndpointRegistration}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/messaging/config/WebMvcStompEndpointRegistryTests.java

@@ -33,7 +33,6 @@ import org.springframework.web.socket.messaging.SubProtocolWebSocketHandler;
 import static org.junit.Assert.*;
 import static org.junit.Assert.assertEquals;
 
-
 /**
  * Test fixture for {@link WebMvcStompEndpointRegistry}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/messaging/config/WebSocketMessageBrokerConfigurationSupportTests.java

@@ -47,7 +47,6 @@ import java.util.Map;
 
 import static org.junit.Assert.*;
 
-
 /**
  * Test fixture for {@link WebSocketMessageBrokerConfigurationSupport}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/server/DefaultHandshakeHandlerTests.java

@@ -35,7 +35,6 @@ import org.springframework.web.socket.support.WebSocketHttpHeaders;
 import static org.junit.Assert.assertEquals;
 import static org.mockito.Mockito.*;
 
-
 /**
  * Test fixture for {@link DefaultHandshakeHandler}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/server/config/AbstractWebSocketHandlerRegistrationTests.java

@@ -37,7 +37,6 @@ import org.springframework.web.socket.sockjs.transport.handler.WebSocketTranspor
 
 import static org.junit.Assert.*;
 
-
 /**
  * Test fixture for {@link AbstractWebSocketHandlerRegistration}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/server/config/WebSocketConfigurationTests.java

@@ -39,7 +39,6 @@ import org.springframework.web.socket.sockjs.transport.handler.WebSocketTranspor
 
 import static org.junit.Assert.*;
 
-
 /**
  * Integration tests for WebSocket Java server-side configuration.
  *

spring-websocket/src/test/java/org/springframework/web/socket/server/support/HandshakeInterceptorChainTests.java

@@ -29,7 +29,6 @@ import org.springframework.web.socket.server.HandshakeInterceptor;
 
 import static org.mockito.Mockito.*;
 
-
 /**
  * Test fixture for {@link HandshakeInterceptorChain}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/server/support/HttpSessionHandshakeInterceptorTests.java

@@ -28,7 +28,6 @@ import org.springframework.web.socket.WebSocketHandler;
 
 import static org.junit.Assert.*;
 
-
 /**
  * Test fixture for {@link HttpSessionHandshakeInterceptor}.
  *

spring-websocket/src/test/java/org/springframework/web/socket/support/TestPrincipal.java

@@ -18,7 +18,6 @@ package org.springframework.web.socket.support;
 
 import java.security.Principal;
 
-
 /**
  * An implementation of {@link Principal} for testing.
  *