Improve PubSubIntegrationTest

Ensuring that the node has no items in
transientNotificationOnlyNodeWithoutItemTest() is not right. An
implementation is free to create an item with an ID and return it. The
item is just not guaranteed to be persistent.

Also add a dummy payload to
transientNotificationOnlyNodeWithItemTest().

smack-integration-test/build.gradle

@@ -23,6 +23,8 @@ dependencies {
 	// (ab)uses @Before from org.junit
 	compile "org.junit.vintage:junit-vintage-engine:$junitVersion"
 	compile 'junit:junit:4.12'
+	// Add Junit 5 API for e.g. assertThrows()
+	implementation "org.junit.jupiter:junit-jupiter-api:$junitVersion"
 	testCompile "org.jxmpp:jxmpp-jid:$jxmppVersion:tests"
 }
 

smack-integration-test/src/main/java/org/jivesoftware/smackx/pubsub/PubSubIntegrationTest.java

@@ -18,14 +18,13 @@ package org.jivesoftware.smackx.pubsub;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.junit.Assert.fail;
-
-import java.util.List;
 
+import org.jivesoftware.smack.SmackConfiguration;
 import org.jivesoftware.smack.SmackException.NoResponseException;
 import org.jivesoftware.smack.SmackException.NotConnectedException;
 import org.jivesoftware.smack.XMPPException.XMPPErrorException;
+import org.jivesoftware.smack.packet.StandardExtensionElement;
 import org.jivesoftware.smack.packet.StanzaError;
 
 import org.igniterealtime.smack.inttest.AbstractSmackIntegrationTest;
@@ -69,8 +68,6 @@ public class PubSubIntegrationTest extends AbstractSmackIntegrationTest {
         try {
             LeafNode leafNode = (LeafNode) node;
             leafNode.publish();
-            List<Item> items = leafNode.getItems();
-            assertTrue(items.isEmpty());
         }
         finally {
             pubSubManagerOne.deleteNode(nodename);
@@ -95,6 +92,7 @@ public class PubSubIntegrationTest extends AbstractSmackIntegrationTest {
     public void transientNotificationOnlyNodeWithItemTest() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
         final String nodename = "sinttest-transient-notificationonly-withitem-nodename-" + testRunId;
         final String itemId = "sinttest-transient-notificationonly-withitem-itemid-" + testRunId;
+
         ConfigureForm defaultConfiguration = pubSubManagerOne.getDefaultConfiguration();
         ConfigureForm config = new ConfigureForm(defaultConfiguration.createAnswerForm());
         // Configure the node as "Notification-Only Node".
@@ -102,12 +100,23 @@ public class PubSubIntegrationTest extends AbstractSmackIntegrationTest {
         // Configure the node as "transient" (set persistent_items to 'false')
         config.setPersistentItems(false);
         Node node = pubSubManagerOne.createNode(nodename, config);
+
+        // Add a dummy payload. If there is no payload, but just an item ID, then ejabberd will *not* return an error,
+        // which I believe to be non-compliant behavior (although, granted, the XEP is not very clear about this). A user
+        // which sends an empty item with ID to an node that is configured to be notification-only and transient probably
+        // does something wrong, as the item's ID will never appear anywhere. Hence it would be nice if the user would be
+        // made aware of this issue by returning an error. Sadly ejabberd does not do so.
+        // See also https://github.com/processone/ejabberd/issues/2864#issuecomment-500741915
+        final StandardExtensionElement dummyPayload = StandardExtensionElement.builder("dummy-payload",
+                        SmackConfiguration.SMACK_URL_STRING).setText(testRunId).build();
+
         try {
+            XMPPErrorException e = assertThrows(XMPPErrorException.class, () -> {
                 LeafNode leafNode = (LeafNode) node;
-            leafNode.publish(new Item(itemId));
+
-            fail("An exception should have been thrown.");
+                Item item = new PayloadItem<>(itemId, dummyPayload);
-        }
+                leafNode.publish(item);
-        catch (XMPPErrorException e) {
+            });
             assertEquals(StanzaError.Type.MODIFY, e.getStanzaError().getType());
             assertNotNull(e.getStanzaError().getExtension("item-forbidden", "http://jabber.org/protocol/pubsub#errors"));
         }