fix(xep): Fix usage of 'max' in publish options (#33)

This commit fixes two issues:
1. Fix an issue where [PubSubManager.publish] would always, if given
   publish options with maxItems set to 'max', use 'max' in the
   max_items publish options, even if the server indicates it does not
   support that.
2. Fix an issue with the StanzaExpectation, where it would let every
   stanza pass.

packages/moxxmpp/lib/src/xeps/xep_0060/xep_0060.dart

@@ -1,3 +1,5 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:meta/meta.dart';
 import 'package:moxxmpp/src/events.dart';
 import 'package:moxxmpp/src/jid.dart';
 import 'package:moxxmpp/src/managers/base.dart';
@@ -130,7 +132,10 @@ class PubSubManager extends XmppManagerBase {
     return count;
   }
 
-  Future<PubSubPublishOptions> _preprocessPublishOptions(
+  // TODO(PapaTutuWawa): This should return a Result<T> in case we cannot proceed
+  //                     with the requested configuration.
+  @visibleForTesting
+  Future<PubSubPublishOptions> preprocessPublishOptions(
     String jid,
     String node,
     PubSubPublishOptions options,
@@ -285,7 +290,7 @@ class PubSubManager extends XmppManagerBase {
   }) async {
     PubSubPublishOptions? pubOptions;
     if (options != null) {
-      pubOptions = await _preprocessPublishOptions(jid, node, options);
+      pubOptions = await preprocessPublishOptions(jid, node, options);
     }
 
     final result = await getAttributes().sendStanza(
@@ -310,14 +315,11 @@ class PubSubManager extends XmppManagerBase {
                   )
                 ],
               ),
-              ...options != null
+              if (pubOptions != null)
-                  ? [
+                XMLNode(
-                      XMLNode(
+                  tag: 'publish-options',
-                        tag: 'publish-options',
+                  children: [pubOptions.toXml()],
-                        children: [options.toXml()],
+                ),
-                      ),
-                    ]
-                  : [],
             ],
           )
         ],

packages/moxxmpp/test/helpers/manager.dart

@@ -0,0 +1,63 @@
+import 'dart:async';
+import 'package:moxxmpp/src/connection.dart';
+import 'package:moxxmpp/src/connectivity.dart';
+import 'package:moxxmpp/src/jid.dart';
+import 'package:moxxmpp/src/managers/attributes.dart';
+import 'package:moxxmpp/src/managers/base.dart';
+import 'package:moxxmpp/src/reconnect.dart';
+import 'package:moxxmpp/src/settings.dart';
+import 'package:moxxmpp/src/socket.dart';
+import 'package:moxxmpp/src/stringxml.dart';
+
+import '../helpers/xmpp.dart';
+
+/// This class allows registering managers for easier testing.
+class TestingManagerHolder {
+  TestingManagerHolder({
+    BaseSocketWrapper? socket,
+  }) : _socket = socket ?? StubTCPSocket([]);
+
+  final BaseSocketWrapper _socket;
+
+  final Map<String, XmppManagerBase> _managers = {};
+
+  static final JID jid = JID.fromString('testuser@example.org/abc123');
+  static final ConnectionSettings settings = ConnectionSettings(
+    jid: jid,
+    password: 'abc123',
+    useDirectTLS: true,
+    allowPlainAuth: true,
+  );
+
+  Future<XMLNode> _sendStanza(stanza, { StanzaFromType addFrom = StanzaFromType.full, bool addId = true, bool awaitable = true, bool encrypted = false, bool forceEncryption = false, }) async {
+    return XMLNode.fromString('<iq />');
+  }
+
+  T? _getManagerById<T extends XmppManagerBase>(String id) {
+    return _managers[id] as T?;
+  }
+
+  Future<void> register(XmppManagerBase manager) async {
+    manager.register(
+      XmppManagerAttributes(
+        sendStanza: _sendStanza,
+        getConnection: () => XmppConnection(
+          TestingReconnectionPolicy(),
+          AlwaysConnectedConnectivityManager(),
+          _socket,
+        ),
+        getConnectionSettings: () => settings,
+        sendNonza: (_) {},
+        sendEvent: (_) {},
+        getSocket: () => _socket,
+        isFeatureSupported: (_) => false,
+        getNegotiatorById: getNegotiatorNullStub,
+        getFullJID: () => jid,
+        getManagerById: _getManagerById,
+      ),
+    );
+
+    await manager.postRegisterCallback();
+    _managers[manager.id] = manager;
+  }
+}

packages/moxxmpp/test/helpers/xmpp.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:convert';
 import 'package:moxxmpp/moxxmpp.dart';
 import 'package:test/test.dart';
 
@@ -13,8 +14,8 @@ T? getManagerNullStub<T extends XmppManagerBase>(String id) {
 }
 
 abstract class ExpectationBase {
-
   ExpectationBase(this.expectation, this.response);
+
   final String expectation;
   final String response;
 
@@ -33,27 +34,84 @@ class StringExpectation extends ExpectationBase {
 /// 
 class StanzaExpectation extends ExpectationBase {
   StanzaExpectation(String expectation, String response, {this.ignoreId = false, this.adjustId = false }) : super(expectation, response);
+
   final bool ignoreId;
   final bool adjustId;
   
   @override
   bool matches(String input) {
     final ex = XMLNode.fromString(expectation);
-    final recv = XMLNode.fromString(expectation);
+    final recv = XMLNode.fromString(input);
 
     return compareXMLNodes(recv, ex, ignoreId: ignoreId);
   }
 }
 
-class StubTCPSocket extends BaseSocketWrapper { // Request -> Response(s)
+/// Use [settings] to build the beginning of a play that can be used with StubTCPSocket. [settings]'s allowPlainAuth must
+/// be set to true.
+List<ExpectationBase> buildAuthenticatedPlay(ConnectionSettings settings) {
+  assert(settings.allowPlainAuth, 'SASL PLAIN must be allowed');
+
+  final plain = base64.encode(utf8.encode('\u0000${settings.jid.local}\u0000${settings.password}'));
+  return [
+    StringExpectation(
+      "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='${settings.jid.domain}' xml:lang='en'>",
+      '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="${settings.jid.domain}"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
+      <mechanism>PLAIN</mechanism>
+    </mechanisms>
+  </stream:features>''',
+      ),
+      StringExpectation(
+        "<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='PLAIN'>$plain</auth>",
+        '<success xmlns="urn:ietf:params:xml:ns:xmpp-sasl" />'
+      ),
+      StringExpectation(
+        "<stream:stream xmlns='jabber:client' version='1.0' xmlns:stream='http://etherx.jabber.org/streams' to='${settings.jid.domain}' xml:lang='en'>",
+        '''
+<stream:stream
+    xmlns="jabber:client"
+    version="1.0"
+    xmlns:stream="http://etherx.jabber.org/streams"
+    from="test.server"
+    xml:lang="en">
+  <stream:features xmlns="http://etherx.jabber.org/streams">
+    <bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">
+      <required/>
+    </bind>
+  </stream:features>
+''',
+      ),
+      StanzaExpectation(
+        '<iq xmlns="jabber:client" type="set" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"/></iq>',
+        '<iq xmlns="jabber:client" type="result" id="a"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><jid>${settings.jid.toBare()}/MU29eEZn</jid></bind></iq>',
+        ignoreId: true,
+      ),
+      StanzaExpectation(
+        "<presence xmlns='jabber:client' from='${settings.jid.toBare()}/MU29eEZn'><show>chat</show></presence>",
+        '',
+      ),
+  ];
+}
+
+class StubTCPSocket extends BaseSocketWrapper { // Request -> Response(s)
+  StubTCPSocket(this._play);
+
+  StubTCPSocket.authenticated(ConnectionSettings settings, List<ExpectationBase> play) : _play = [
+    ...buildAuthenticatedPlay(settings),
+    ...play,
+  ];
 
-  StubTCPSocket({ required List<ExpectationBase> play })
-    : _play = play,
-      _dataStream = StreamController<String>.broadcast(),
-      _eventStream = StreamController<XmppSocketEvent>.broadcast();
   int _state = 0;
-  final StreamController<String> _dataStream;
+  final StreamController<String> _dataStream = StreamController<String>.broadcast();
-  final StreamController<XmppSocketEvent> _eventStream;
+  final StreamController<XmppSocketEvent> _eventStream = StreamController<XmppSocketEvent>.broadcast();
   final List<ExpectationBase> _play;
   String? lastId;
 
@@ -99,9 +157,11 @@ class StubTCPSocket extends BaseSocketWrapper { // Request -> Response(s)
       str = str.substring(0, str.length - 16);
     }
 
-    if (!expectation.matches(str)) {
+    expect(
-      expect(true, false, reason: 'Expected ${expectation.expectation}, got $str');
+      expectation.matches(str),
-    }
+      true,
+      reason: 'Expected ${expectation.expectation}, got $str',
+    );
 
     // Make sure to only progress if everything passed so far
     _state++;
@@ -109,7 +169,7 @@ class StubTCPSocket extends BaseSocketWrapper { // Request -> Response(s)
     var response = expectation.response;
     if (expectation is StanzaExpectation) {
       final inputNode = XMLNode.fromString(str);
-      lastId = inputNode.attributes['id'];
+      lastId = inputNode.attributes['id'] as String?;
 
       if (expectation.adjustId) {
         final outputNode = XMLNode.fromString(response);
@@ -134,4 +194,4 @@ class StubTCPSocket extends BaseSocketWrapper { // Request -> Response(s)
 
   @override
   bool managesKeepalives() => false;
-}
+}

packages/moxxmpp/test/stringxml_test.dart

@@ -29,4 +29,52 @@ void main() {
     expect(compareXMLNodes(node1.firstTag('body')!, XMLNode.fromString('<body>Hallo</body>')), true);
     expect(compareXMLNodes(node1.firstTagByXmlns('a')!, XMLNode.fromString('<a xmlns="a" />')), true);
   });
+
+  test('Test compareXMLNodes', () {
+    final node1 = XMLNode.fromString('''
+ <iq type='set' id='0327c373-2e34-46bd-ab7f-1274a6f7095f' to='pubsub.server.example.org' from='testuser@example.org/MU29eEZn' xmlns='jabber:client'>
+  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
+    <publish node='princely_musings'>
+      <item id='current'>
+        <test-item  />
+      </item>
+    </publish>
+    <publish-options >
+      <x xmlns='jabber:x:data' type='submit'>
+        <field var='FORM_TYPE' type='hidden'>
+          <value>http://jabber.org/protocol/pubsub#publish-options</value>
+        </field>
+        <field var='pubsub#max_items'>
+          <value>max</value>
+        </field>
+      </x>
+    </publish-options>
+  </pubsub>
+</iq>
+''',
+    );
+    final node2 = XMLNode.fromString('''
+<iq type="set" to="pubsub.server.example.org" id="a">
+  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
+    <publish node='princely_musings'>
+      <item id="current">
+        <test-item />
+      </item>
+    </publish>
+    <publish-options>
+      <x xmlns='jabber:x:data' type='submit'>
+        <field var='FORM_TYPE' type='hidden'>
+          <value>http://jabber.org/protocol/pubsub#publish-options</value>
+        </field>
+        <field var='pubsub#max_items'>
+          <value>1</value>
+        </field>
+      </x>
+    </publish-options>
+  </pubsub>
+</iq>
+''');
+
+    expect(compareXMLNodes(node1, node2, ignoreId: true), false);
+  });
 }

packages/moxxmpp/test/xeps/xep_0060_test.dart

@@ -2,121 +2,23 @@ import 'package:moxxmpp/moxxmpp.dart';
 import 'package:test/test.dart';
 
 import '../helpers/logging.dart';
+import '../helpers/manager.dart';
 import '../helpers/xmpp.dart';
 
 class StubbedDiscoManager extends DiscoManager {
-  StubbedDiscoManager() : super([]);
+  StubbedDiscoManager(this._itemError) : super([]);
+
+  final bool _itemError;
 
   @override
   Future<Result<DiscoError, DiscoInfo>> discoInfoQuery(String entity, { String? node, bool shouldEncrypt = true }) async {
     final result = DiscoInfo.fromQuery(
       XMLNode.fromString(
-        '''<query xmlns='http://jabber.org/protocol/disco#info'>
+        '''
-<identity category='account' type='registered'/>
+<query xmlns='http://jabber.org/protocol/disco#info'>
-<identity type='service' category='pubsub' name='PubSub acs-clustered'/>
+  <identity category='pubsub' type='service' />
-<feature var='http://jabber.org/protocol/pubsub#retrieve-default'/>
+  <feature var="http://jabber.org/protocol/pubsub" />
-<feature var='http://jabber.org/protocol/pubsub#purge-nodes'/>
+  <feature var="http://jabber.org/protocol/pubsub#multi-items" />
-<feature var='http://jabber.org/protocol/pubsub#subscribe'/>
-<feature var='http://jabber.org/protocol/pubsub#member-affiliation'/>
-<feature var='http://jabber.org/protocol/pubsub#subscription-notifications'/>
-<feature var='http://jabber.org/protocol/pubsub#create-nodes'/>
-<feature var='http://jabber.org/protocol/pubsub#outcast-affiliation'/>
-<feature var='http://jabber.org/protocol/pubsub#get-pending'/>
-<feature var='http://jabber.org/protocol/pubsub#presence-notifications'/>
-<feature var='urn:xmpp:ping'/>
-<feature var='http://jabber.org/protocol/pubsub#delete-nodes'/>
-<feature var='http://jabber.org/protocol/pubsub#config-node'/>
-<feature var='http://jabber.org/protocol/pubsub#retrieve-items'/>
-<feature var='http://jabber.org/protocol/pubsub#access-whitelist'/>
-<feature var='http://jabber.org/protocol/pubsub#access-presence'/>
-<feature var='http://jabber.org/protocol/disco#items'/>
-<feature var='http://jabber.org/protocol/pubsub#meta-data'/>
-<feature var='http://jabber.org/protocol/pubsub#multi-items'/>
-<feature var='http://jabber.org/protocol/pubsub#item-ids'/>
-<feature var='urn:xmpp:mam:1'/>
-<feature var='http://jabber.org/protocol/pubsub#instant-nodes'/>
-<feature var='urn:xmpp:mam:2'/>
-<feature var='urn:xmpp:mam:2#extended'/>
-<feature var='http://jabber.org/protocol/pubsub#modify-affiliations'/>
-<feature var='http://jabber.org/protocol/pubsub#multi-collection'/>
-<feature var='http://jabber.org/protocol/pubsub#persistent-items'/>
-<feature var='http://jabber.org/protocol/pubsub#create-and-configure'/>
-<feature var='http://jabber.org/protocol/pubsub#publisher-affiliation'/>
-<feature var='http://jabber.org/protocol/pubsub#access-open'/>
-<feature var='http://jabber.org/protocol/pubsub#retrieve-affiliations'/>
-<feature var='http://jabber.org/protocol/pubsub#access-authorize'/>
-<feature var='jabber:iq:version'/>
-<feature var='http://jabber.org/protocol/pubsub#retract-items'/>
-<feature var='http://jabber.org/protocol/pubsub#manage-subscriptions'/>
-<feature var='http://jabber.org/protocol/commands'/>
-<feature var='http://jabber.org/protocol/pubsub#auto-subscribe'/>
-<feature var='http://jabber.org/protocol/pubsub#publish-options'/>
-<feature var='http://jabber.org/protocol/pubsub#access-roster'/>
-<feature var='http://jabber.org/protocol/pubsub#publish'/>
-<feature var='http://jabber.org/protocol/pubsub#collections'/>
-<feature var='http://jabber.org/protocol/pubsub#retrieve-subscriptions'/>
-<feature var='http://jabber.org/protocol/disco#info'/>
-<x type='result' xmlns='jabber:x:data'>
-<field type='hidden' var='FORM_TYPE'>
-<value>http://jabber.org/network/serverinfo</value>
-</field>
-<field type='list-multi' var='abuse-addresses'>
-<value>mailto:support@tigase.net</value>
-<value>xmpp:tigase@mix.tigase.im</value>
-<value>xmpp:tigase@muc.tigase.org</value>
-<value>https://tigase.net/technical-support</value>
-</field>
-</x>
-<feature var='http://jabber.org/protocol/pubsub#auto-create'/>
-<feature var='http://jabber.org/protocol/pubsub#auto-subscribe'/>
-<feature var='urn:xmpp:mix:pam:2'/>
-<feature var='urn:xmpp:carbons:2'/>
-<feature var='urn:xmpp:carbons:rules:0'/>
-<feature var='jabber:iq:auth'/>
-<feature var='vcard-temp'/>
-<feature var='http://jabber.org/protocol/amp'/>
-<feature var='msgoffline'/>
-<feature var='http://jabber.org/protocol/disco#info'/>
-<feature var='http://jabber.org/protocol/disco#items'/>
-<feature var='urn:xmpp:blocking'/>
-<feature var='urn:xmpp:reporting:0'/>
-<feature var='urn:xmpp:reporting:abuse:0'/>
-<feature var='urn:xmpp:reporting:spam:0'/>
-<feature var='urn:xmpp:reporting:1'/>
-<feature var='urn:xmpp:ping'/>
-<feature var='urn:ietf:params:xml:ns:xmpp-sasl'/>
-<feature var='http://jabber.org/protocol/pubsub'/>
-<feature var='http://jabber.org/protocol/pubsub#owner'/>
-<feature var='http://jabber.org/protocol/pubsub#publish'/>
-<identity type='pep' category='pubsub'/>
-<feature var='urn:xmpp:pep-vcard-conversion:0'/>
-<feature var='urn:xmpp:bookmarks-conversion:0'/>
-<feature var='urn:xmpp:archive:auto'/>
-<feature var='urn:xmpp:archive:manage'/>
-<feature var='urn:xmpp:push:0'/>
-<feature var='tigase:push:away:0'/>
-<feature var='tigase:push:encrypt:0'/>
-<feature var='tigase:push:encrypt:aes-128-gcm'/>
-<feature var='tigase:push:filter:ignore-unknown:0'/>
-<feature var='tigase:push:filter:groupchat:0'/>
-<feature var='tigase:push:filter:muted:0'/>
-<feature var='tigase:push:priority:0'/>
-<feature var='tigase:push:jingle:0'/>
-<feature var='jabber:iq:roster'/>
-<feature var='jabber:iq:roster-dynamic'/>
-<feature var='urn:xmpp:mam:1'/>
-<feature var='urn:xmpp:mam:2'/>
-<feature var='urn:xmpp:mam:2#extended'/>
-<feature var='urn:xmpp:mix:pam:2#archive'/>
-<feature var='jabber:iq:version'/>
-<feature var='urn:xmpp:time'/>
-<feature var='jabber:iq:privacy'/>
-<feature var='urn:ietf:params:xml:ns:xmpp-bind'/>
-<feature var='urn:xmpp:extdisco:2'/>
-<feature var='http://jabber.org/protocol/commands'/>
-<feature var='urn:ietf:params:xml:ns:vcard-4.0'/>
-<feature var='jabber:iq:private'/>
-<feature var='urn:ietf:params:xml:ns:xmpp-session'/>
 </query>'''
       ),
       JID.fromString('pubsub.server.example.org'),
@@ -124,49 +26,156 @@ class StubbedDiscoManager extends DiscoManager {
 
     return Result(result);
   }
-}
 
-T? getDiscoManagerStub<T extends XmppManagerBase>(String id) {
+  @override
-  return StubbedDiscoManager() as T;
+  Future<Result<DiscoError, List<DiscoItem>>> discoItemsQuery(String entity, {String? node, bool shouldEncrypt = true}) async {
+    if (_itemError) {
+      return Result(
+        UnknownDiscoError(),
+      );
+    }
+    return const Result<DiscoError, List<DiscoItem>>(
+      <DiscoItem>[],
+    );
+  }
 }
   
 void main() {
   initLogger();
 
-  test('Test publishing with pubsub#max_items when the server does not support it', () async {
+  test('Test pre-processing with pubsub#max_items when the server does not support it (1/2)', () async {
-    XMLNode? sent;
     final manager = PubSubManager();
-    manager.register(
+    final TestingManagerHolder tm = TestingManagerHolder();
-      XmppManagerAttributes(
+    await tm.register(StubbedDiscoManager(false));
-        sendStanza: (stanza, { StanzaFromType addFrom = StanzaFromType.full, bool addId = true, bool awaitable = true, bool encrypted = false, bool forceEncryption = false, }) async {
+    await tm.register(manager);
-          sent = stanza;
 
-          return XMLNode.fromString('<iq />');
+    final result = await manager.preprocessPublishOptions(
-        },
+      'pubsub.server.example.org',
-        sendNonza: (_) {},
+      'urn:xmpp:omemo:2:bundles',
-        sendEvent: (_) {},
+      const PubSubPublishOptions(maxItems: 'max'),
-        getManagerById: getDiscoManagerStub,
-        getConnectionSettings: () => ConnectionSettings(
-          jid: JID.fromString('hallo@example.server'),
-          password: 'password',
-          useDirectTLS: true,
-          allowPlainAuth: false,
-        ),
-        isFeatureSupported: (_) => false,
-        getFullJID: () => JID.fromString('hallo@example.server/uwu'),
-        getSocket: () => StubTCPSocket(play: []),
-        getConnection: () => XmppConnection(TestingReconnectionPolicy(), AlwaysConnectedConnectivityManager(), StubTCPSocket(play: [])),
-        getNegotiatorById: getNegotiatorNullStub,
-      ),
     );
 
-  // final result = await manager.preprocessPublishOptions(
+    expect(result.maxItems, '1');
-  //   'pubsub.server.example.org',
-  //   'example:node',
-  //   PubSubPublishOptions(
-  //     maxItems: 'max', 
-  //   ),
-  // );
-
   });
-}
+
+  test('Test pre-processing with pubsub#max_items when the server does not support it (2/2)', () async {
+    final manager = PubSubManager();
+    final TestingManagerHolder tm = TestingManagerHolder();
+    await tm.register(StubbedDiscoManager(true));
+    await tm.register(manager);
+
+    final result = await manager.preprocessPublishOptions(
+      'pubsub.server.example.org',
+      'urn:xmpp:omemo:2:bundles',
+      const PubSubPublishOptions(maxItems: 'max'),
+    );
+
+    expect(result.maxItems, '1');
+  });
+
+  test('Test publishing with pubsub#max_items when the server does not support it', () async {
+    final socket = StubTCPSocket.authenticated(
+      TestingManagerHolder.settings,
+      [
+        StanzaExpectation(
+          '''
+<iq type="get" to="pubsub.server.example.org" id="a" from="testuser@example.org/MU29eEZn" xmlns="jabber:client">
+  <query xmlns="http://jabber.org/protocol/disco#info" />
+</iq>
+''',
+          '''
+<iq type="result" from="pubsub.server.example.org" id="a" xmlns="jabber:client">
+  <query xmlns="http://jabber.org/protocol/disco#info">
+    <identity category='pubsub' type='service' />
+    <feature var="http://jabber.org/protocol/pubsub" />
+    <feature var="http://jabber.org/protocol/pubsub#multi-items" />
+  </query>
+</iq>
+''',
+          ignoreId: true,
+          adjustId: true,
+        ),
+        StanzaExpectation(
+          '''
+<iq type="get" to="pubsub.server.example.org" id="a" from="testuser@example.org/MU29eEZn" xmlns="jabber:client">
+  <query xmlns="http://jabber.org/protocol/disco#items" node="princely_musings" />
+</iq>
+''',
+          '''
+<iq type="result" from="pubsub.server.example.org" id="a" xmlns="jabber:client">
+  <query xmlns="http://jabber.org/protocol/disco#items" node="princely_musings" />
+</iq>
+''',
+          ignoreId: true,
+          adjustId: true,
+        ),
+        StanzaExpectation(
+          '''
+<iq type="set" to="pubsub.server.example.org" id="a" from="testuser@example.org/MU29eEZn" xmlns="jabber:client">
+  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
+    <publish node='princely_musings'>
+      <item id="current">
+        <test-item />
+      </item>
+    </publish>
+    <publish-options>
+      <x xmlns='jabber:x:data' type='submit'>
+        <field var='FORM_TYPE' type='hidden'>
+          <value>http://jabber.org/protocol/pubsub#publish-options</value>
+        </field>
+        <field var='pubsub#max_items'>
+          <value>1</value>
+        </field>
+      </x>
+    </publish-options>
+  </pubsub>
+</iq>''',
+          '''
+<iq type="result" from="pubsub.server.example.org" id="a" xmlns="jabber:client">
+  <pubsub xmlns='http://jabber.org/protocol/pubsub'>
+    <publish node='princely_musings'>
+      <item id='current'/>
+    </publish>
+  </pubsub>
+</iq>''',
+          ignoreId: true,
+          adjustId: true,
+        )
+      ],
+    );
+
+    final connection = XmppConnection(
+      TestingReconnectionPolicy(),
+      AlwaysConnectedConnectivityManager(),
+      socket,
+    );
+
+    await connection.registerManagers([
+      PubSubManager(),
+      DiscoManager([]),
+      PresenceManager(),
+      MessageManager(),
+      RosterManager(TestingRosterStateManager(null, [])),
+      PingManager(),
+    ]);
+    connection..registerFeatureNegotiators([
+      SaslPlainNegotiator(),
+      ResourceBindingNegotiator(),
+    ])
+    ..setConnectionSettings(TestingManagerHolder.settings);
+    await connection.connect(
+      waitUntilLogin: true,
+    );
+
+    final item = XMLNode(tag: "test-item");
+    final result = await connection.getManagerById<PubSubManager>(pubsubManager)!.publish(
+      'pubsub.server.example.org',
+      'princely_musings',
+      item,
+      id: 'current',
+      options: const PubSubPublishOptions(maxItems: 'max'),
+    );
+
+    expect(result.isType<bool>(), true);
+  });
+}