test: add retention policy endpoint tests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hifaizsk

tests/test_chat_misc.py

@@ -600,3 +600,53 @@ def test_event_hooks_sqs_sns(client: Stream):
     finally:
         # Restore original hooks
         client.update_app(event_hooks=original_hooks or [])
+
+
+def test_set_retention_policy(client: Stream):
+    """Set a retention policy for old messages."""
+    try:
+        response = client.chat.set_retention_policy(
+            policy="old-messages", max_age_hours=720
+        )
+        assert response.data is not None
+        assert response.data.policy is not None
+        assert response.data.policy.policy == "old-messages"
+    finally:
+        try:
+            client.chat.delete_retention_policy(policy="old-messages")
+        except Exception:
+            pass
+
+
+def test_get_retention_policy(client: Stream):
+    """Get retention policies."""
+    # First set a policy to ensure there's something to get
+    client.chat.set_retention_policy(policy="old-messages", max_age_hours=720)
+
+    try:
+        response = client.chat.get_retention_policy()
+        assert response.data is not None
+        assert response.data.policies is not None
+        assert len(response.data.policies) > 0
+    finally:
+        try:
+            client.chat.delete_retention_policy(policy="old-messages")
+        except Exception:
+            pass
+
+
+def test_get_retention_policy_runs(client: Stream):
+    """Get retention policy run history."""
+    response = client.chat.get_retention_policy_runs()
+    assert response.data is not None
+    assert response.data.runs is not None
+
+
+def test_delete_retention_policy(client: Stream):
+    """Delete a retention policy."""
+    # First set a policy, then delete it
+    client.chat.set_retention_policy(policy="old-messages", max_age_hours=720)
+
+    response = client.chat.delete_retention_policy(policy="old-messages")
+    assert response.data is not None
+    assert response.data.duration is not None