Use immutabledict instead of frozendict (#15113)

Additionally:

* Consistently use `freeze()` in test

---------

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
Co-authored-by: 6543 <6543@obermui.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/tests/config/test_workers.py b/tests/config/test_workers.py
index ef6294ecb2..49a6bdf408 100644
--- a/tests/config/test_workers.py
+++ b/tests/config/test_workers.py
@@ -14,14 +14,14 @@
 from typing import Any, Mapping, Optional
 from unittest.mock import Mock
 
-from frozendict import frozendict
+from immutabledict import immutabledict
 
 from synapse.config import ConfigError
 from synapse.config.workers import WorkerConfig
 
 from tests.unittest import TestCase
 
-_EMPTY_FROZENDICT: Mapping[str, Any] = frozendict()
+_EMPTY_IMMUTABLEDICT: Mapping[str, Any] = immutabledict()
 
 
 class WorkerDutyConfigTestCase(TestCase):
@@ -29,7 +29,7 @@ class WorkerDutyConfigTestCase(TestCase):
         self,
         worker_app: str,
         worker_name: Optional[str],
-        extras: Mapping[str, Any] = _EMPTY_FROZENDICT,
+        extras: Mapping[str, Any] = _EMPTY_IMMUTABLEDICT,
     ) -> WorkerConfig:
         root_config = Mock()
         root_config.worker_app = worker_app