Add missing @Override annotations

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

@@ -137,6 +137,7 @@ public class TestWebSocketSession implements WebSocketSession {
 		this.remoteAddress = remoteAddress;
 	}
 
+	@Override
 	public String getAcceptedProtocol() {
 		return this.protocol;
 	}

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

@@ -53,6 +53,7 @@ public class HandshakeInterceptorChainTests extends AbstractHttpRequestTests {
 	private Map<String, Object> attributes;
 
 
+	@Override
 	@BeforeEach
 	public void setup() {
 		super.setup();

spring-websocket/src/test/java/org/springframework/web/socket/sockjs/transport/session/StubSockJsServiceConfig.java

@@ -74,6 +74,7 @@ public class StubSockJsServiceConfig implements SockJsServiceConfig {
 		this.messageCodec = messageCodec;
 	}
 
+	@Override
 	public int getHttpMessageCacheSize() {
 		return this.httpMessageCacheSize;
 	}