diff --git a/tests/test_cache_manager.py b/tests/test_cache_manager.py
index b29cd7e..202cb11 100644
--- a/tests/test_cache_manager.py
+++ b/tests/test_cache_manager.py
@@ -12,6 +12,7 @@ def test_cache_service_reexports_cache_manager_state():
     assert cache_service._SALES_OPTIONS_CACHE is cache_manager._SALES_OPTIONS_CACHE
     assert cache_service._SALES_ANALYSIS_RESULT_CACHE is cache_manager._SALES_ANALYSIS_RESULT_CACHE
     assert cache_service._DASHBOARD_DATA_CACHE is cache_manager._DASHBOARD_DATA_CACHE
+    assert cache_service._SALES_RESULT_TTL == cache_manager._SALES_CACHE_TTL
 
 
 def test_routes_share_sales_cache_manager_state():
@@ -106,3 +107,13 @@ def test_cache_dicts_are_only_defined_in_cache_manager():
         ("services/cache_manager.py", "_SALES_PROCESSED_CACHE = {}"),
         ("services/cache_manager.py", "_DASHBOARD_DATA_CACHE = {"),
     ]
+
+
+def test_sales_cache_ttl_is_only_defined_in_cache_manager():
+    assignments = []
+    for path in [ROOT / "app.py", *ROOT.glob("routes/*.py"), *ROOT.glob("services/*.py")]:
+        text = path.read_text(encoding="utf-8")
+        if "_SALES_CACHE_TTL =" in text:
+            assignments.append(path.relative_to(ROOT).as_posix())
+
+    assert assignments == ["services/cache_manager.py"]