Add a test that a new verified member is seen on the second device going online (#3836)

- Alice has two devices, the second is offline.
- Alice creates a verified group and sends a QR invitation to Bob.
- Bob joins the group and sends a message there. Alice sees it.
- Alice's second devices goes online, but doesn't see Bob in the group.

python/tests/test_0_complex_or_slow.py

@@ -492,3 +492,45 @@ def test_multidevice_sync_seen(acfactory, lp):
     assert ac1_clone_message.is_in_seen
     # Test that the timer is started on the second device after synchronizing the seen status.
     assert "Expires: " in ac1_clone_message.get_message_info()
+
+
+def test_see_new_verified_member_after_going_online(acfactory, tmpdir, lp):
+    """The test for the bug #3836:
+    - Alice has two devices, the second is offline.
+    - Alice creates a verified group and sends a QR invitation to Bob.
+    - Bob joins the group and sends a message there. Alice sees it.
+    - Alice's second devices goes online, but doesn't see Bob in the group.
+    """
+    ac1, ac2 = acfactory.get_online_accounts(2)
+    ac2_addr = ac2.get_config("addr")
+    ac1_offl = acfactory.new_online_configuring_account(cloned_from=ac1)
+    for ac in [ac1, ac1_offl]:
+        ac.set_config("bcc_self", "1")
+    acfactory.bring_accounts_online()
+    dir = tmpdir.mkdir("exportdir")
+    ac1.export_self_keys(dir.strpath)
+    ac1_offl.import_self_keys(dir.strpath)
+    ac1_offl.stop_io()
+
+    lp.sec("ac1: create verified-group QR, ac2 scans and joins")
+    chat = ac1.create_group_chat("hello", verified=True)
+    assert chat.is_protected()
+    qr = chat.get_join_qr()
+    lp.sec("ac2: start QR-code based join-group protocol")
+    chat2 = ac2.qr_join_chat(qr)
+    ac1._evtracker.wait_securejoin_inviter_progress(1000)
+
+    lp.sec("ac2: sending message")
+    msg_out = chat2.send_text("hello")
+
+    lp.sec("ac1: receiving message")
+    msg_in = ac1._evtracker.wait_next_incoming_message()
+    assert msg_in.text == msg_out.text
+    assert msg_in.get_sender_contact().addr == ac2_addr
+
+    lp.sec("ac1_offl: going online, receiving message")
+    ac1_offl.start_io()
+    ac1_offl._evtracker.wait_securejoin_inviter_progress(1000)
+    msg_in = ac1_offl._evtracker.wait_next_incoming_message()
+    assert msg_in.text == msg_out.text
+    assert msg_in.get_sender_contact().addr == ac2_addr

python/tests/test_1_online.py

@@ -88,7 +88,7 @@ def test_export_import_self_keys(acfactory, tmpdir, lp):
         lp.indent(dir.strpath + os.sep + name)
     lp.sec("importing into existing account")
     ac2.import_self_keys(dir.strpath)
-    (key_id2,) = ac2._evtracker.get_info_regex_groups(r".*stored.*KeyId\((.*)\).*", check_error=False)
+    (key_id2,) = ac2._evtracker.get_info_regex_groups(r".*stored.*KeyId\((.*)\).*")
     assert key_id2 == key_id