diff --git a/tests/test_token_viz.py b/tests/test_token_viz.py
index 1f0af0b2..8f9fa8f2 100644
--- a/tests/test_token_viz.py
+++ b/tests/test_token_viz.py
@@ -85,6 +85,10 @@ def test_gemini_cache_fields_accessible() -> None:
  assert hasattr(ai_client, "_GEMINI_CACHE_TTL")
 
 def test_anthropic_history_lock_accessible() -> None:
- """_anthropic_history_lock must be accessible for cache hint rendering."""
- assert hasattr(ai_client, "_anthropic_history_lock")
- assert hasattr(ai_client, "_anthropic_history")
\ No newline at end of file
+ """provider_state.get_history('anthropic').lock must be accessible for cache hint rendering."""
+ from src import provider_state
+ hist = provider_state.get_history("anthropic")
+ assert hasattr(hist, "lock")
+ assert hasattr(hist, "messages")
+ assert not hasattr(ai_client, "_anthropic_history_lock")
+ assert not hasattr(ai_client, "_anthropic_history")
\ No newline at end of file