Remove unused imports

spring-messaging/src/test/java/org/springframework/messaging/simp/SimpSessionScopeTests.java

@@ -20,10 +20,9 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.mockito.Mockito;
-import org.springframework.beans.BeansException;
+
 import org.springframework.beans.factory.ObjectFactory;
 
-import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import static org.junit.Assert.assertThat;

spring-messaging/src/test/java/org/springframework/messaging/simp/config/MessageBrokerConfigurationTests.java

@@ -27,7 +27,7 @@ import org.junit.Before;
 import org.junit.Test;
 
 import org.mockito.Mockito;
-import org.springframework.beans.DirectFieldAccessor;
+
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;

spring-messaging/src/test/java/org/springframework/messaging/simp/stomp/StompHeaderAccessorTests.java

@@ -32,7 +32,6 @@ import org.springframework.messaging.support.MessageBuilder;
 import org.springframework.messaging.support.MessageHeaderAccessor;
 import org.springframework.util.AlternativeJdkIdGenerator;
 import org.springframework.util.LinkedMultiValueMap;
-import org.springframework.util.MimeType;
 import org.springframework.util.MimeTypeUtils;
 import org.springframework.util.MultiValueMap;
 

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

@@ -23,7 +23,6 @@ import java.util.HashSet;
 import java.util.Map;
 import java.util.UUID;
 
-import org.hamcrest.CoreMatchers;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;