Passthrough 3rd-party imports in tests helpers module

Author: dandavison

tests/helpers/nexus.py

@@ -2,15 +2,17 @@
 from dataclasses import dataclass
 from typing import Any, Mapping, Optional
 
-import httpx
-from google.protobuf import json_format
-
 import temporalio.api
 import temporalio.api.nexus.v1
 import temporalio.api.operatorservice.v1
+import temporalio.workflow
 from temporalio.client import Client
 from temporalio.converter import FailureConverter, PayloadConverter
 
+with temporalio.workflow.unsafe.imports_passed_through():
+    import httpx
+    from google.protobuf import json_format
+
 
 def make_nexus_endpoint_name(task_queue: str) -> str:
     # Create endpoints for different task queues without name collisions.