VertxTestBase report mode FORBIDDEN should throw an assertion error instead of UnsupportedOperationException

Author: vietj

vertx-core/src/test/java/io/vertx/test/core/VertxTestBase.java

@@ -208,7 +208,7 @@ protected void checkThread() {
         }
         break;
       case FORBIDDEN:
-        throw new UnsupportedOperationException("Strictly forbidden to call an assertion on AsyncTestBase");
+        throw new AssertionError("Strictly forbidden to call an assertion on AsyncTestBase");
     }
   }