Split all the e2e tests in their own files

Some duplication is avoided, but most importantly: it’s much much cleaner,
easier to find, functions have been cleaned up (functools.partial usages are
now hidden), etc.

tests/end_to_end/scenarios/mam_with_timestamps.py

@@ -0,0 +1,43 @@
+from scenarios import *
+
+scenario = (
+    scenarios.simple_channel_join.scenario,
+    
+    # Send two channel messages
+    send_stanza("<message from='{jid_one}/{resource_one}' to='#foo%{irc_server_one}' type='groupchat'><body>coucou</body></message>"),
+    expect_stanza("/message[@from='#foo%{irc_server_one}/{nick_one}'][@to='{jid_one}/{resource_one}'][@type='groupchat']/body[text()='coucou']",
+                  "/message/stable_id:stanza-id[@by='#foo%{irc_server_one}'][@id]"),
+
+    send_stanza("<message from='{jid_one}/{resource_one}' to='#foo%{irc_server_one}' type='groupchat'><body>coucou 2</body></message>"),
+    # Record the current time
+    expect_stanza("/message[@from='#foo%{irc_server_one}/{nick_one}'][@to='{jid_one}/{resource_one}'][@type='groupchat']/body[text()='coucou 2']",
+                  after = save_current_timestamp_plus_delta("first_timestamp", datetime.timedelta(seconds=1))),
+
+    # Wait two seconds before sending two new messages
+    sleep_for(2),
+    send_stanza("<message from='{jid_one}/{resource_one}' to='#foo%{irc_server_one}' type='groupchat'><body>coucou 3</body></message>"),
+    send_stanza("<message from='{jid_one}/{resource_one}' to='#foo%{irc_server_one}' type='groupchat'><body>coucou 4</body></message>"),
+    expect_stanza("/message[@type='groupchat']/body[text()='coucou 3']"),
+    expect_stanza("/message[@type='groupchat']/body[text()='coucou 4']",
+                  after = save_current_timestamp_plus_delta("second_timestamp", datetime.timedelta(seconds=1))),
+
+    # Retrieve the archive, after our saved datetime
+    send_stanza("""<iq to='#foo%{irc_server_one}' from='{jid_one}/{resource_one}' type='set' id='id8'>
+                          <query xmlns='urn:xmpp:mam:2' queryid='qid16'>
+                            <x type='submit' xmlns='jabber:x:data'>
+                             <field var='FORM_TYPE' xmlns='jabber:x:data'><value xmlns='jabber:x:data'>urn:xmpp:mam:2</value></field>
+                             <field var='start' xmlns='jabber:x:data'><value xmlns='jabber:x:data'>{first_timestamp}</value></field>
+                             <field var='end' xmlns='jabber:x:data'><value xmlns='jabber:x:data'>{second_timestamp}</value></field>
+                            </x>
+                          </query>
+                         </iq>"""),
+
+    expect_stanza("/message/mam:result[@queryid='qid16']/forward:forwarded/delay:delay",
+                  "/message/mam:result/forward:forwarded/client:message[@from='#foo%{irc_server_one}/{nick_one}'][@type='groupchat']/client:body[text()='coucou 3']"),
+
+    expect_stanza("/message/mam:result[@queryid='qid16']/forward:forwarded/delay:delay",
+                  "/message/mam:result/forward:forwarded/client:message[@from='#foo%{irc_server_one}/{nick_one}'][@type='groupchat']/client:body[text()='coucou 4']"),
+
+    expect_stanza("/iq[@type='result'][@id='id8'][@from='#foo%{irc_server_one}'][@to='{jid_one}/{resource_one}']",
+                  "/iq/mam:fin[@complete='true']/rsm:set"),
+)