BTHLABS-50: Safari Web extension

Co-authored-by: Tomek Wójcik <labs@tomekwojcik.pl>
Co-committed-by: Tomek Wójcik <labs@tomekwojcik.pl>

services/packages/testing/hotpocket_testing/fixtures/__init__.py

@@ -1,2 +1,3 @@
 from .celery import *  # noqa: F401,F403
 from .common import *  # noqa: F401,F403
+from .rpc import *  # noqa: F401,F403

services/packages/testing/hotpocket_testing/fixtures/rpc.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# type: ignore
+from __future__ import annotations
+
+import uuid
+
+import pytest
+
+
+@pytest.fixture
+def rpc_call_factory():
+    def factory(method, params, id_=None):
+        return {
+            'jsonrpc': '2.0',
+            'id': str(id_ or uuid.uuid4()),
+            'method': method,
+            'params': params,
+        }
+
+    return factory