From d1acdfaf9a0d488d5bd7bf5aff3c76914f986f29 Mon Sep 17 00:00:00 2001
From: Maximilian Rink <maximilian.rink@telekom.de>
Date: Tue, 13 Oct 2026 22:18:56 +0200
Subject: [PATCH] test(cache): isolate namespace regression test

---
 litellm/caching/caching.py                    |  6 +-----
 .../test_authenticated_namespace_cache_key.py | 20 +++++++++++++++++++
 tests/unit/caching/test_caching.py            | 15 --------------
 3 files changed, 21 insertions(+), 20 deletions(-)
 create mode 100644 tests/unit/caching/test_authenticated_namespace_cache_key.py

diff --git a/litellm/caching/caching.py b/litellm/caching/caching.py
index faf660dfe1f..4a1b9f3430c 100644
--- a/litellm/caching/caching.py
+++ b/litellm/caching/caching.py
@@ -657,11 +657,7 @@ class Cache:
             metadata_namespace,
         )
         namespace: Final[str | None] = (
-            ":".join(
-                value
-                for value in namespace_parts
-                if isinstance(value, str) and value
-            )
+            ":".join(value for value in namespace_parts if isinstance(value, str) and value)
             if authenticated_namespace is not None
             else requested_namespace or metadata_namespace or self.namespace
         )
diff --git a/tests/unit/caching/test_authenticated_namespace_cache_key.py b/tests/unit/caching/test_authenticated_namespace_cache_key.py
new file mode 100644
index 00000000000..4fcfd975d5f
--- /dev/null
+++ b/tests/unit/caching/test_authenticated_namespace_cache_key.py
@@ -0,0 +1,20 @@
+from typing import Final
+
+from litellm.caching.caching import Cache
+from litellm.proxy._types import UserAPIKeyAuth
+from litellm.types.caching import LiteLLMCacheType
+
+
+def test_authenticated_cache_keys_preserve_request_and_metadata_namespaces() -> None:
+    cache: Final = Cache(type=LiteLLMCacheType.LOCAL, namespace="instance")
+    caller: Final = UserAPIKeyAuth(api_key="fixture", token="hashed-key", team_id="team")
+
+    key: Final = cache._add_namespace_to_cache_key(
+        "hashed-response",
+        cache={"namespace": "request"},
+        metadata={"user_api_key_auth": caller, "redis_namespace": "metadata"},
+    )
+
+    assert key is not None
+    assert key.startswith("instance:caller:")
+    assert key.endswith(":request:metadata:hashed-response")
diff --git a/tests/unit/caching/test_caching.py b/tests/unit/caching/test_caching.py
index 022a2c8c8c3..4b8e1c9f3d7 100644
--- a/tests/unit/caching/test_caching.py
+++ b/tests/unit/caching/test_caching.py
@@ -55,21 +55,6 @@ def test_authenticated_proxy_callers_get_distinct_exact_cache_keys() -> None:
     assert key_a != key_b
 
 
-def test_authenticated_cache_keys_preserve_request_and_metadata_namespaces() -> None:
-    cache: Final = Cache(type=LiteLLMCacheType.LOCAL, namespace="instance")
-    caller: Final = UserAPIKeyAuth(api_key="fixture", token="hashed-key", team_id="team")
-
-    key: Final = cache._add_namespace_to_cache_key(
-        "hashed-response",
-        cache={"namespace": "request"},
-        metadata={"user_api_key_auth": caller, "redis_namespace": "metadata"},
-    )
-
-    assert key is not None
-    assert key.startswith("instance:caller:")
-    assert key.endswith(":request:metadata:hashed-response")
-
-
 def test_authenticated_callers_without_server_token_fail_closed_for_all_key_forms() -> None:
     cache: Final = Cache(type=LiteLLMCacheType.LOCAL, namespace="qa")
     caller_a: Final = UserAPIKeyAuth(api_key="raw-a", team_id="team-a", user_id="user-a").model_copy(