Add @FunctionalInterface on candidate interfaces

Issue: SPR-14432

spring-test/src/main/java/org/springframework/test/context/ActiveProfilesResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -32,6 +32,7 @@ package org.springframework.test.context;
  * @since 4.0
  * @see ActiveProfiles
  */
+@FunctionalInterface
 public interface ActiveProfilesResolver {
 
 	/**

spring-test/src/main/java/org/springframework/test/web/client/RequestMatcher.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -29,6 +29,7 @@ import org.springframework.http.client.ClientHttpRequest;
  * @author Craig Walls
  * @since 3.2
  */
+@FunctionalInterface
 public interface RequestMatcher {
 
 	/**

spring-test/src/main/java/org/springframework/test/web/client/ResponseCreator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -29,6 +29,7 @@ import org.springframework.test.web.client.response.MockRestResponseCreators;
  * @author Craig Walls
  * @since 3.2
  */
+@FunctionalInterface
 public interface ResponseCreator {
 
 	/**

spring-test/src/main/java/org/springframework/test/web/servlet/ResultHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -44,6 +44,7 @@ package org.springframework.test.web.servlet;
  * @author Sam Brannen
  * @since 3.2
  */
+@FunctionalInterface
 public interface ResultHandler {
 
 	/**

spring-test/src/main/java/org/springframework/test/web/servlet/ResultMatcher.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -46,6 +46,7 @@ package org.springframework.test.web.servlet;
  * @author Sam Brannen
  * @since 3.2
  */
+@FunctionalInterface
 public interface ResultMatcher {
 
 	/**

spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/WebRequestMatcher.java

@@ -26,6 +26,7 @@ import com.gargoylesoftware.htmlunit.WebRequest;
  * @see org.springframework.test.web.servlet.htmlunit.HostRequestMatcher
  * @see org.springframework.test.web.servlet.htmlunit.UrlRegexRequestMatcher
  */
+@FunctionalInterface
 public interface WebRequestMatcher {
 
 	/**

spring-test/src/main/java/org/springframework/test/web/servlet/request/RequestPostProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -32,6 +32,7 @@ import org.springframework.mock.web.MockHttpServletRequest;
  * @author Rob Winch
  * @since 3.2
  */
+@FunctionalInterface
 public interface RequestPostProcessor {
 
 	/**