Type hints for tests.appservice (#14990)

* Accept a Sequence of events in synapse.appservice

This avoids some casts/ignores in the tests I'm about to fixup. It seems
that `List[Mock]` is not a subtype of `List[EventBase]`, but
`Sequence[Mock]` is a subtype of `Sequence[EventBase]`. So presumably
`Mock` is considered a subtype of anything, much like `Any`.

* make tests.appservice.test_scheduler pass mypy

* Extra hints in tests.appservice.test_scheduler

* Extra hints in tests.appservice.test_api

* Extra hints in tests.appservice.test_appservice

* Disallow untyped defs

* Changelog

1 files changed, 2 insertions, 2 deletions

diff --git a/synapse/appservice/__init__.py b/synapse/appservice/__init__.py

index 65615f50b8..35c330a3c4 100644
--- a/synapse/appservice/__init__.py
+++ b/synapse/appservice/__init__.py
@@ -16,7 +16,7 @@
 import logging
 import re
 from enum import Enum
-from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Pattern
+from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Pattern, Sequence
 
 import attr
 from netaddr import IPSet
@@ -377,7 +377,7 @@ class AppServiceTransaction:
         self,
         service: ApplicationService,
         id: int,
-        events: List[EventBase],
+        events: Sequence[EventBase],
         ephemeral: List[JsonDict],
         to_device_messages: List[JsonDict],
         one_time_keys_count: TransactionOneTimeKeysCount,