Fix checkstyle violation

Author: rstoyanchev

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerAdapterTests.java

@@ -29,6 +29,7 @@
 import java.util.Map;
 
 import javax.servlet.AsyncEvent;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;