Update testing improvements in "What's New"

src/asciidoc/whats-new.adoc

@@ -692,6 +692,8 @@ Spring 4.3 also improves the caching abstraction as follows:
 
 * The JUnit support in the _Spring TestContext Framework_ now requires JUnit 4.12 or higher.
 * New `SpringRunner` _alias_ for the `SpringJUnit4ClassRunner`.
+* Test related annotations may now be declared on interfaces -- for example, for use with
+  _test interfaces_ that make use of Java 8 based interface default methods.
 * An empty declaration of `@ContextConfiguration` can now be completely omitted if default
   XML files, Groovy scripts, or `@Configuration` classes are detected.
 * `@Transactional` test methods are no longer required to be `public` (e.g., in TestNG and JUnit 5).
@@ -707,8 +709,10 @@ Spring 4.3 also improves the caching abstraction as follows:
   custom `ContextLoader`.
 * `@Sql` and `@SqlGroup` may now be used as _meta-annotations_ to create custom _composed
   annotations_ with attribute overrides.
+* `ReflectionTestUtils` now automatically unwraps proxies when setting or getting a field.
 * Server-side Spring MVC Test supports expectations on response headers with multiple values.
 * Server-side Spring MVC Test parses form data request content and populates request parameters.
+* Server-side Spring MVC Test supports mock-like assertions for invoked handler methods.
 * Client-side REST test support allows indicating how many times a request is expected and
   whether the order of declaration for expectations should be ignored (see <<spring-mvc-test-client>>).
 * Client-side REST Test supports expectations for form data in the request body.