[sinttest] Move throw statement before setting the listener in mucDes…

…troyTest()

Also add tryDestroy(muc).

smack-integration-test/src/main/java/org/jivesoftware/smackx/muc/MultiUserChatIntegrationTest.java

@@ -99,6 +99,12 @@ public void mucDestroyTest() throws TimeoutException, Exception {
         MultiUserChat muc = mucManagerOne.getMultiUserChat(mucAddress);
         createMuc(muc, Resourcepart.from("one-" + randomString));
 
+        // These would be a test implementation bug, not assertion failure.
+        if (!mucManagerOne.getJoinedRooms().contains(mucAddress)) {
+            tryDestroy(muc);
+            throw new IllegalStateException("Expected user to have joined a room '" + mucAddress + "' (but does not appear to have done so).");
+        }
+
         final SimpleResultSyncPoint mucDestroyed = new SimpleResultSyncPoint();
 
         UserStatusListener userStatusListener = new UserStatusListener() {
@@ -110,11 +116,6 @@ public void roomDestroyed(MultiUserChat alternateMUC, String reason) {
 
         muc.addUserStatusListener(userStatusListener);
 
-        // These would be a test implementation bug, not assertion failure.
-        if (!mucManagerOne.getJoinedRooms().contains(mucAddress)) {
-            throw new IllegalStateException("Expected user to have joined a room '" + mucAddress + "' (but does not appear to have done so).");
-        }
-
         try {
             muc.destroy("Dummy reason", null);
             assertResult(mucDestroyed, "Expected " + conOne.getUser() + " to be notified of destruction of room " + mucAddress + " (but was not).");