Add convenient MailTemplateInstance#sendAndAwait()

extensions/mailer/deployment/src/test/java/io/quarkus/mailer/MailTemplateRecordNoInjectionTest.java

@@ -26,7 +26,7 @@ public void testMailTemplateRecord() {
         // Intentionally use programmatic lookup to obtain the MockMailbox
         MockMailbox mockMailbox = Arc.container().instance(MockMailbox.class).get();
         new confirmation("Ondrej").to("[email protected]").from("[email protected]").subject("test mailer")
-                .send().await().indefinitely();
+                .sendAndAwait();
         assertEquals(1, mockMailbox.getMailMessagesSentTo("[email protected]").size());
         MailMessage message = mockMailbox.getMailMessagesSentTo("[email protected]").get(0);
         assertEquals("[email protected]", message.getFrom());

extensions/mailer/runtime/src/main/java/io/quarkus/mailer/MailTemplate.java

@@ -4,6 +4,7 @@
 
 import io.quarkus.mailer.reactive.ReactiveMailer;
 import io.quarkus.qute.TemplateInstance;
+import io.smallrye.common.annotation.CheckReturnValue;
 import io.smallrye.mutiny.Uni;
 
 /**
@@ -117,10 +118,20 @@ default MailTemplateInstance setAttribute(String key, Object value) {
          * @return a {@link Uni} indicating when the mails have been sent
          * @see ReactiveMailer#send(Mail...)
          */
+        @CheckReturnValue
         default Uni<Void> send() {
             throw new UnsupportedOperationException();
         }
 
+        /**
+         * Sends all e-mail definitions and blocks the current thread while waiting for the result.
+         *
+         * @see #send()
+         */
+        default void sendAndAwait() {
+            send().await().indefinitely();
+        }
+
         /**
          * The returned instance does not represent a specific template but a delegating template.
          * <p>