UniAsserterInterceptor - improve the javadoc and docs

docs/src/main/asciidoc/hibernate-reactive-panache.adoc

@@ -858,7 +858,7 @@ Testing reactive Panache entities in a `@QuarkusTest` is slightly more complicat
 The `quarkus-test-vertx` dependency provides the `@io.quarkus.test.vertx.RunOnVertxContext` annotation and the `io.quarkus.test.vertx.UniAsserter` class which are intended precisely for this purpose. 
 The usage is described in the xref:hibernate-reactive.adoc#testing[Hibernate Reactive] guide.
 
-You can also extend the `io.quarkus.test.vertx.UniAsserterInterceptor` to customize the behavior of the injected `UniAsserter`.
+You can also extend the `io.quarkus.test.vertx.UniAsserterInterceptor` to wrap the injected `UniAsserter` and customize the behavior.
 For example, the interceptor can be used to execute the assert methods within a separate database transaction.
 
 .`UniAsserterInterceptor` Example

docs/src/main/asciidoc/hibernate-reactive.adoc

@@ -245,6 +245,32 @@ public class SomeTest {
 
 NOTE: See the Javadoc of `UniAsserter` for a full description of the various methods that can be used for creating assertions.
 
+[TIP]
+====
+You can also extend the `io.quarkus.test.vertx.UniAsserterInterceptor` to wrap the injected `UniAsserter` and customize the default behavior. For example, the interceptor can be used to execute the assert methods within a separate database transaction.:
+
+[source,java]
+----
+@QuarkusTest
+public class SomeTest {
+
+   @Test
+   @RunOnVertxContext
+   public void testEntity(UniAsserter asserter) {
+      asserter = new UniAsserterInterceptor(asserter) {
+         @Override
+         protected <T> Supplier<Uni<T>> transformUni(Supplier<Uni<T>> uniSupplier) {
+            return () -> Panache.withTransaction(uniSupplier);
+         }
+      };
+      asserter.execute(() -> new MyEntity().persist());
+      asserter.assertEquals(() -> MyEntity.count(), 1l);
+      asserter.execute(() -> MyEntity.deleteAll());
+   }
+}
+----
+====
+
 [[hr-limitations]]
 == Limitations and other things you should know
 

test-framework/vertx/src/main/java/io/quarkus/test/vertx/UniAsserterInterceptor.java

@@ -7,10 +7,11 @@
 import io.smallrye.mutiny.Uni;
 
 /**
- * Subclasses can be used to customize the behavior of the injected {@link UniAsserter}.
- *
+ * A subclass can be used to wrap the injected {@link UniAsserter} and customize the default behavior.
+ * <p>
  * Specifically, it can intercept selected methods and perform some additional logic. The {@link #transformUni(Supplier)} method
  * can be used to transform the provided {@link Uni} supplier for assertion and {@link UniAsserter#execute(Supplier)} methods.
+ * <p>
  * For example, it can be used to perform all assertions within the scope of a database transaction:
  *
  * <pre>
@@ -24,7 +25,7 @@
  *         }
  *
  *         &#64;Override
- *         protected <T> Supplier<Uni<T>> transformUni(Supplier<Uni<T>> uniSupplier) {
+ *         protected &lt;T&gt; Supplier&lt;Uni&lt;T&gt;&gt; transformUni(Supplier&lt;Uni&lt;T&gt;&gt; uniSupplier) {
  *             // Assert/execute methods are invoked within a database transaction
  *             return () -> Panache.withTransaction(uniSupplier);
  *         }
@@ -35,12 +36,34 @@
  *     public void testEntity(UniAsserter asserter) {
  *         asserter = new TransactionalUniAsserterInterceptor(asserter);
  *         asserter.execute(() -> new MyEntity().persist());
- *         asserter.assertEquals(() -> MyEntity.count(), 1l);
+ *         asserter.assertEquals(() -&gt; MyEntity.count(), 1l);
  *         asserter.execute(() -> MyEntity.deleteAll());
  *     }
  * }
  * </pre>
  *
+ * Alternatively, an anonymous class can be used as well:
+ *
+ * <pre>
+ * &#64;QuarkusTest
+ * public class SomeTest {
+ *
+ *     &#64;Test
+ *     &#64;RunOnVertxContext
+ *     public void testEntity(UniAsserter asserter) {
+ *         asserter = new UniAsserterInterceptor(asserter) {
+ *             &#64;Override
+ *             protected &lt;T&gt; Supplier&lt;Uni&lt;T&gt;&gt; transformUni(Supplier&lt;Uni&lt;T&gt;&gt; uniSupplier) {
+ *                 return () -&gt; Panache.withTransaction(uniSupplier);
+ *             }
+ *         };
+ *         asserter.execute(() -&gt; new MyEntity().persist());
+ *         asserter.assertEquals(() -&gt; MyEntity.count(), 1l);
+ *         asserter.execute(() -&gt; MyEntity.deleteAll());
+ *     }
+ * }
+ * </pre>
+ *
  */
 public abstract class UniAsserterInterceptor implements UniAsserter {
 

test-framework/vertx/src/test/java/io/quarkus/test/vertx/UniAsserterTest.java

@@ -181,7 +181,12 @@ public void testInterceptorFailures() {
     @Test
     public void testInterceptorData() {
         testAsserter(ua -> {
-            UniAsserter asserter = new DataUniAsserterInterceptor(ua);
+            UniAsserter asserter = new UniAsserterInterceptor(ua) {
+                @Override
+                public Object getData(String key) {
+                    return "found";
+                }
+            };
             asserter.assertEquals(() -> Uni.createFrom().item(asserter.getData("foo")), "found");
         });
     }
@@ -198,20 +203,6 @@ protected <T> Supplier<Uni<T>> transformUni(Supplier<Uni<T>> uniSupplier) {
         }
 
     }
-
-    static class DataUniAsserterInterceptor extends UniAsserterInterceptor {
-
-        public DataUniAsserterInterceptor(UniAsserter asserter) {
-            super(asserter);
-        }
-
-        @Override
-        public Object getData(String key) {
-            return "found";
-        }
-
-    }
-
     // utils
 
     private <T> void testAsserter(Consumer<UniAsserter> assertion) {