Mercurial > libervia-backend
view sat/test/test_plugin_misc_groupblog.py @ 3254:6cf4bd6972c2
core, frontends: avatar refactoring:
/!\ huge commit
Avatar logic has been reworked around the IDENTITY plugin: plugins able to handle avatar
or other identity related metadata (like nicknames) register to IDENTITY plugin in the
same way as for other features like download/upload. Once registered, IDENTITY plugin will
call them when suitable in order of priority, and handle caching.
Methods to manage those metadata from frontend now use serialised data.
For now `avatar` and `nicknames` are handled:
- `avatar` is now a dict with `path` + metadata like `media_type`, instead of just a string
path
- `nicknames` is now a list of nicknames in order of priority. This list is never empty,
and `nicknames[0]` should be the preferred nickname to use by frontends in most cases.
In addition to contact specified nicknames, user set nickname (the one set in roster) is
used in priority when available.
Among the side changes done with this commit, there are:
- a new `contactGet` bridge method to get roster metadata for a single contact
- SatPresenceProtocol.send returns a Deferred to check when it has actually been sent
- memory's methods to handle entities data now use `client` as first argument
- metadata filter can be specified with `getIdentity`
- `getAvatar` and `setAvatar` are now part of the IDENTITY plugin instead of XEP-0054 (and
there signature has changed)
- `isRoom` and `getBareOrFull` are now part of XEP-0045 plugin
- jp avatar/get command uses `xdg-open` first when available for `--show` flag
- `--no-cache` has been added to jp avatar/get and identity/get
- jp identity/set has been simplified, explicit options (`--nickname` only for now) are
used instead of `--field`. `--field` may come back in the future if necessary for extra
data.
- QuickContactList `SetContact` now handle None as a value, and doesn't use it to delete the
metadata anymore
- improved cache handling for `metadata` and `nicknames` in quick frontend
- new `default` argument in QuickContactList `getCache`
author | Goffi <goffi@goffi.org> |
---|---|
date | Tue, 14 Apr 2020 21:00:33 +0200 |
parents | 559a625a236b |
children | be6d91572633 |
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#!/usr/bin/env python3 # SAT: a jabber client # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org) # Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. """ Plugin groupblogs """ from .constants import Const as C from sat.test import helpers, helpers_plugins from sat.plugins import plugin_misc_groupblog from sat.plugins import plugin_xep_0060 from sat.plugins import plugin_xep_0277 from sat.plugins import plugin_xep_0163 from sat.plugins import plugin_misc_text_syntaxes from twisted.internet import defer from twisted.words.protocols.jabber import jid import importlib NS_PUBSUB = "http://jabber.org/protocol/pubsub" DO_NOT_COUNT_COMMENTS = -1 SERVICE = "pubsub.example.com" PUBLISHER = "test@example.org" OTHER_PUBLISHER = "other@xmpp.net" NODE_ID = "urn:xmpp:groupblog:{publisher}".format(publisher=PUBLISHER) OTHER_NODE_ID = "urn:xmpp:groupblog:{publisher}".format(publisher=OTHER_PUBLISHER) ITEM_ID_1 = "c745a688-9b02-11e3-a1a3-c0143dd4fe51" COMMENT_ID_1 = "d745a688-9b02-11e3-a1a3-c0143dd4fe52" COMMENT_ID_2 = "e745a688-9b02-11e3-a1a3-c0143dd4fe53" def COMMENTS_NODE_ID(publisher=PUBLISHER): return "urn:xmpp:comments:_{id}__urn:xmpp:groupblog:{publisher}".format( id=ITEM_ID_1, publisher=publisher ) def COMMENTS_NODE_URL(publisher=PUBLISHER): return "xmpp:{service}?node={node}".format( service=SERVICE, id=ITEM_ID_1, node=COMMENTS_NODE_ID(publisher).replace(":", "%3A").replace("@", "%40"), ) def ITEM(publisher=PUBLISHER): return """ <item id='{id}' xmlns='{ns}'> <entry> <title type='text'>The Uses of This World</title> <id>{id}</id> <updated>2003-12-12T17:47:23Z</updated> <published>2003-12-12T17:47:23Z</published> <link href='{comments_node_url}' rel='replies' title='comments'/> <author> <name>{publisher}</name> </author> </entry> </item> """.format( ns=NS_PUBSUB, id=ITEM_ID_1, publisher=publisher, comments_node_url=COMMENTS_NODE_URL(publisher), ) def COMMENT(id_=COMMENT_ID_1): return """ <item id='{id}' xmlns='{ns}'> <entry> <title type='text'>The Uses of This World</title> <id>{id}</id> <updated>2003-12-12T17:47:23Z</updated> <published>2003-12-12T17:47:23Z</published> <author> <name>{publisher}</name> </author> </entry> </item> """.format( ns=NS_PUBSUB, id=id_, publisher=PUBLISHER ) def ITEM_DATA(id_=ITEM_ID_1, count=0): res = { "id": ITEM_ID_1, "type": "main_item", "content": "The Uses of This World", "author": PUBLISHER, "updated": "1071251243.0", "published": "1071251243.0", "service": SERVICE, "comments": COMMENTS_NODE_URL_1, "comments_service": SERVICE, "comments_node": COMMENTS_NODE_ID_1, } if count != DO_NOT_COUNT_COMMENTS: res.update({"comments_count": str(count)}) return res def COMMENT_DATA(id_=COMMENT_ID_1): return { "id": id_, "type": "comment", "content": "The Uses of This World", "author": PUBLISHER, "updated": "1071251243.0", "published": "1071251243.0", "service": SERVICE, "node": COMMENTS_NODE_ID_1, "verified_publisher": "false", } COMMENTS_NODE_ID_1 = COMMENTS_NODE_ID() COMMENTS_NODE_ID_2 = COMMENTS_NODE_ID(OTHER_PUBLISHER) COMMENTS_NODE_URL_1 = COMMENTS_NODE_URL() COMMENTS_NODE_URL_2 = COMMENTS_NODE_URL(OTHER_PUBLISHER) ITEM_1 = ITEM() ITEM_2 = ITEM(OTHER_PUBLISHER) COMMENT_1 = COMMENT(COMMENT_ID_1) COMMENT_2 = COMMENT(COMMENT_ID_2) def ITEM_DATA_1(count=0): return ITEM_DATA(count=count) COMMENT_DATA_1 = COMMENT_DATA() COMMENT_DATA_2 = COMMENT_DATA(COMMENT_ID_2) class XEP_groupblogTest(helpers.SatTestCase): def setUp(self): self.host = helpers.FakeSAT() self.host.plugins["XEP-0060"] = plugin_xep_0060.XEP_0060(self.host) self.host.plugins["XEP-0163"] = plugin_xep_0163.XEP_0163(self.host) importlib.reload(plugin_misc_text_syntaxes) # reload the plugin to avoid conflict error self.host.plugins["TEXT_SYNTAXES"] = plugin_misc_text_syntaxes.TextSyntaxes( self.host ) self.host.plugins["XEP-0277"] = plugin_xep_0277.XEP_0277(self.host) self.plugin = plugin_misc_groupblog.GroupBlog(self.host) self.plugin._initialise = self._initialise self.__initialised = False self._initialise(C.PROFILE[0]) def _initialise(self, profile_key): profile = profile_key client = self.host.getClient(profile) if not self.__initialised: client.item_access_pubsub = jid.JID(SERVICE) xep_0060 = self.host.plugins["XEP-0060"] client.pubsub_client = helpers_plugins.FakeSatPubSubClient( self.host, xep_0060 ) client.pubsub_client.parent = client self.psclient = client.pubsub_client helpers.FakeSAT.getDiscoItems = self.psclient.service_getDiscoItems self.__initialised = True return defer.succeed((profile, client)) def _addItem(self, profile, item, parent_node=None): client = self.host.getClient(profile) client.pubsub_client._addItem(item, parent_node) def test_sendGroupBlog(self): self._initialise(C.PROFILE[0]) d = self.psclient.items(SERVICE, NODE_ID) d.addCallback(lambda items: self.assertEqual(len(items), 0)) d.addCallback( lambda __: self.plugin.sendGroupBlog( "PUBLIC", [], "test", {}, C.PROFILE[0] ) ) d.addCallback(lambda __: self.psclient.items(SERVICE, NODE_ID)) return d.addCallback(lambda items: self.assertEqual(len(items), 1)) def test_deleteGroupBlog(self): pub_data = (SERVICE, NODE_ID, ITEM_ID_1) self.host.bridge.expectCall( "personalEvent", C.JID_STR[0], "MICROBLOG_DELETE", {"type": "main_item", "id": ITEM_ID_1}, C.PROFILE[0], ) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.plugin.deleteGroupBlog( pub_data, COMMENTS_NODE_URL_1, profile_key=C.PROFILE[0] ) ) return d.addCallback(self.assertEqual, None) def test_updateGroupBlog(self): pub_data = (SERVICE, NODE_ID, ITEM_ID_1) new_text = "silfu23RFWUP)IWNOEIOEFÖ" self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.plugin.updateGroupBlog( pub_data, COMMENTS_NODE_URL_1, new_text, {}, profile_key=C.PROFILE[0] ) ) d.addCallback(lambda __: self.psclient.items(SERVICE, NODE_ID)) return d.addCallback( lambda items: self.assertEqual( "".join(items[0].entry.title.children), new_text ) ) def test_sendGroupBlogComment(self): self._initialise(C.PROFILE[0]) d = self.psclient.items(SERVICE, NODE_ID) d.addCallback(lambda items: self.assertEqual(len(items), 0)) d.addCallback( lambda __: self.plugin.sendGroupBlogComment( COMMENTS_NODE_URL_1, "test", {}, profile_key=C.PROFILE[0] ) ) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_1)) return d.addCallback(lambda items: self.assertEqual(len(items), 1)) def test_getGroupBlogs(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.plugin.getGroupBlogs(PUBLISHER, profile_key=C.PROFILE[0]) ) result = ( [ITEM_DATA_1()], {"count": "1", "index": "0", "first": ITEM_ID_1, "last": ITEM_ID_1}, ) return d.addCallback(self.assertEqual, result) def test_getGroupBlogsNoCount(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.plugin.getGroupBlogs( PUBLISHER, count_comments=False, profile_key=C.PROFILE[0] ) ) result = ( [ITEM_DATA_1(DO_NOT_COUNT_COMMENTS)], {"count": "1", "index": "0", "first": ITEM_ID_1, "last": ITEM_ID_1}, ) return d.addCallback(self.assertEqual, result) def test_getGroupBlogsWithIDs(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.plugin.getGroupBlogs( PUBLISHER, [ITEM_ID_1], profile_key=C.PROFILE[0] ) ) result = ( [ITEM_DATA_1()], {"count": "1", "index": "0", "first": ITEM_ID_1, "last": ITEM_ID_1}, ) return d.addCallback(self.assertEqual, result) def test_getGroupBlogsWithRSM(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.plugin.getGroupBlogs( PUBLISHER, rsm_data={"max_": 1}, profile_key=C.PROFILE[0] ) ) result = ( [ITEM_DATA_1()], {"count": "1", "index": "0", "first": ITEM_ID_1, "last": ITEM_ID_1}, ) return d.addCallback(self.assertEqual, result) def test_getGroupBlogsWithComments(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.psclient.publish(SERVICE, COMMENTS_NODE_ID_1, [COMMENT_1]) ) d.addCallback( lambda __: self.plugin.getGroupBlogsWithComments( PUBLISHER, [], profile_key=C.PROFILE[0] ) ) result = ( [ ( ITEM_DATA_1(1), ( [COMMENT_DATA_1], { "count": "1", "index": "0", "first": COMMENT_ID_1, "last": COMMENT_ID_1, }, ), ) ], {"count": "1", "index": "0", "first": ITEM_ID_1, "last": ITEM_ID_1}, ) return d.addCallback(self.assertEqual, result) def test_getGroupBlogsWithComments2(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.psclient.publish( SERVICE, COMMENTS_NODE_ID_1, [COMMENT_1, COMMENT_2] ) ) d.addCallback( lambda __: self.plugin.getGroupBlogsWithComments( PUBLISHER, [], profile_key=C.PROFILE[0] ) ) result = ( [ ( ITEM_DATA_1(2), ( [COMMENT_DATA_1, COMMENT_DATA_2], { "count": "2", "index": "0", "first": COMMENT_ID_1, "last": COMMENT_ID_2, }, ), ) ], {"count": "1", "index": "0", "first": ITEM_ID_1, "last": ITEM_ID_1}, ) return d.addCallback(self.assertEqual, result) def test_getGroupBlogsAtom(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.plugin.getGroupBlogsAtom( PUBLISHER, {"max_": 1}, profile_key=C.PROFILE[0] ) ) def cb(atom): self.assertIsInstance(atom, str) self.assertTrue(atom.startswith('<?xml version="1.0" encoding="utf-8"?>')) return d.addCallback(cb) def test_getMassiveGroupBlogs(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.plugin.getMassiveGroupBlogs( "JID", [jid.JID(PUBLISHER)], {"max_": 1}, profile_key=C.PROFILE[0] ) ) result = { PUBLISHER: ( [ITEM_DATA_1()], {"count": "1", "index": "0", "first": ITEM_ID_1, "last": ITEM_ID_1}, ) } def clean(res): del self.host.plugins["XEP-0060"].node_cache[ C.PROFILE[0] + "@found@" + SERVICE ] return res d.addCallback(clean) d.addCallback(self.assertEqual, result) def test_getMassiveGroupBlogsWithComments(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.psclient.publish( SERVICE, COMMENTS_NODE_ID_1, [COMMENT_1, COMMENT_2] ) ) d.addCallback( lambda __: self.plugin.getMassiveGroupBlogs( "JID", [jid.JID(PUBLISHER)], {"max_": 1}, profile_key=C.PROFILE[0] ) ) result = { PUBLISHER: ( [ITEM_DATA_1(2)], {"count": "1", "index": "0", "first": ITEM_ID_1, "last": ITEM_ID_1}, ) } def clean(res): del self.host.plugins["XEP-0060"].node_cache[ C.PROFILE[0] + "@found@" + SERVICE ] return res d.addCallback(clean) d.addCallback(self.assertEqual, result) def test_getGroupBlogComments(self): self._initialise(C.PROFILE[0]) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.psclient.publish(SERVICE, COMMENTS_NODE_ID_1, [COMMENT_1]) ) d.addCallback( lambda __: self.plugin.getGroupBlogComments( SERVICE, COMMENTS_NODE_ID_1, {"max_": 1}, profile_key=C.PROFILE[0] ) ) result = ( [COMMENT_DATA_1], {"count": "1", "index": "0", "first": COMMENT_ID_1, "last": COMMENT_ID_1}, ) return d.addCallback(self.assertEqual, result) def test_subscribeGroupBlog(self): self._initialise(C.PROFILE[0]) d = self.plugin.subscribeGroupBlog(PUBLISHER, profile_key=C.PROFILE[0]) return d.addCallback(self.assertEqual, None) def test_massiveSubscribeGroupBlogs(self): self._initialise(C.PROFILE[0]) d = self.plugin.massiveSubscribeGroupBlogs( "JID", [jid.JID(PUBLISHER)], profile_key=C.PROFILE[0] ) def clean(res): del self.host.plugins["XEP-0060"].node_cache[ C.PROFILE[0] + "@found@" + SERVICE ] del self.host.plugins["XEP-0060"].node_cache[ C.PROFILE[0] + "@subscriptions@" + SERVICE ] return res d.addCallback(clean) return d.addCallback(self.assertEqual, None) def test_deleteAllGroupBlogs(self): """Delete our main node and associated comments node""" self._initialise(C.PROFILE[0]) self.host.profiles[C.PROFILE[0]].roster.addItem(jid.JID(OTHER_PUBLISHER)) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.psclient.publish( SERVICE, COMMENTS_NODE_ID_1, [COMMENT_1, COMMENT_2] ) ) d.addCallback(lambda __: self.psclient.items(SERVICE, NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_1)) d.addCallback(lambda items: self.assertEqual(len(items), 2)) d.addCallback( lambda __: self.psclient.publish(SERVICE, OTHER_NODE_ID, [ITEM_2]) ) d.addCallback( lambda __: self.psclient.publish( SERVICE, COMMENTS_NODE_ID_2, [COMMENT_1, COMMENT_2] ) ) d.addCallback(lambda __: self.psclient.items(SERVICE, OTHER_NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_2)) d.addCallback(lambda items: self.assertEqual(len(items), 2)) def clean(res): del self.host.plugins["XEP-0060"].node_cache[ C.PROFILE[0] + "@found@" + SERVICE ] return res d.addCallback(lambda __: self.plugin.deleteAllGroupBlogs(C.PROFILE[0])) d.addCallback(clean) d.addCallback(lambda __: self.psclient.items(SERVICE, NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 0)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_1)) d.addCallback(lambda items: self.assertEqual(len(items), 0)) d.addCallback(lambda __: self.psclient.items(SERVICE, OTHER_NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_2)) d.addCallback(lambda items: self.assertEqual(len(items), 2)) return d def test_deleteAllGroupBlogsComments(self): """Delete the comments we posted on other node's""" self._initialise(C.PROFILE[0]) self.host.profiles[C.PROFILE[0]].roster.addItem(jid.JID(OTHER_PUBLISHER)) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.psclient.publish( SERVICE, COMMENTS_NODE_ID_1, [COMMENT_1, COMMENT_2] ) ) d.addCallback(lambda __: self.psclient.items(SERVICE, NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_1)) d.addCallback(lambda items: self.assertEqual(len(items), 2)) d.addCallback( lambda __: self.psclient.publish(SERVICE, OTHER_NODE_ID, [ITEM_2]) ) d.addCallback( lambda __: self.psclient.publish( SERVICE, COMMENTS_NODE_ID_2, [COMMENT_1, COMMENT_2] ) ) d.addCallback(lambda __: self.psclient.items(SERVICE, OTHER_NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_2)) d.addCallback(lambda items: self.assertEqual(len(items), 2)) def clean(res): del self.host.plugins["XEP-0060"].node_cache[ C.PROFILE[0] + "@found@" + SERVICE ] return res d.addCallback(lambda __: self.plugin.deleteAllGroupBlogsComments(C.PROFILE[0])) d.addCallback(clean) d.addCallback(lambda __: self.psclient.items(SERVICE, NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_1)) d.addCallback(lambda items: self.assertEqual(len(items), 2)) d.addCallback(lambda __: self.psclient.items(SERVICE, OTHER_NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_2)) d.addCallback(lambda items: self.assertEqual(len(items), 0)) return d def test_deleteAllGroupBlogsAndComments(self): self._initialise(C.PROFILE[0]) self.host.profiles[C.PROFILE[0]].roster.addItem(jid.JID(OTHER_PUBLISHER)) d = self.psclient.publish(SERVICE, NODE_ID, [ITEM_1]) d.addCallback( lambda __: self.psclient.publish( SERVICE, COMMENTS_NODE_ID_1, [COMMENT_1, COMMENT_2] ) ) d.addCallback(lambda __: self.psclient.items(SERVICE, NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_1)) d.addCallback(lambda items: self.assertEqual(len(items), 2)) d.addCallback( lambda __: self.psclient.publish(SERVICE, OTHER_NODE_ID, [ITEM_2]) ) d.addCallback( lambda __: self.psclient.publish( SERVICE, COMMENTS_NODE_ID_2, [COMMENT_1, COMMENT_2] ) ) d.addCallback(lambda __: self.psclient.items(SERVICE, OTHER_NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_2)) d.addCallback(lambda items: self.assertEqual(len(items), 2)) def clean(res): del self.host.plugins["XEP-0060"].node_cache[ C.PROFILE[0] + "@found@" + SERVICE ] return res d.addCallback( lambda __: self.plugin.deleteAllGroupBlogsAndComments(C.PROFILE[0]) ) d.addCallback(clean) d.addCallback(lambda __: self.psclient.items(SERVICE, NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 0)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_1)) d.addCallback(lambda items: self.assertEqual(len(items), 0)) d.addCallback(lambda __: self.psclient.items(SERVICE, OTHER_NODE_ID)) d.addCallback(lambda items: self.assertEqual(len(items), 1)) d.addCallback(lambda __: self.psclient.items(SERVICE, COMMENTS_NODE_ID_2)) d.addCallback(lambda items: self.assertEqual(len(items), 0)) return d