diff --git a/tests/test_cache_manager.py b/tests/test_cache_manager.py
index 202cb11..e0f4cb4 100644
--- a/tests/test_cache_manager.py
+++ b/tests/test_cache_manager.py
@@ -94,6 +94,31 @@ def test_dashboard_cache_clear_restores_expected_shape(tmp_path, monkeypatch):
     assert stale_cache.exists()
 
 
+def test_sales_analysis_shared_page_cache_roundtrip(tmp_path, monkeypatch):
+    from routes import sales_routes
+
+    monkeypatch.setattr(sales_routes, "_SALES_ANALYSIS_PAGE_CACHE_DIR", tmp_path)
+    cache_key = "sales_analysis:page_context:test"
+    context = {"kpi": {"revenue": 123}, "active_page": "sales"}
+
+    sales_routes._set_sales_shared_page_context_cache(cache_key, context)
+
+    assert sales_routes._get_sales_shared_page_context_cache(cache_key) == context
+
+
+def test_clear_sales_cache_removes_shared_page_cache_files(tmp_path, monkeypatch):
+    from services import cache_manager
+
+    monkeypatch.setattr(cache_manager, "_SALES_ANALYSIS_PAGE_CACHE_DIR", tmp_path)
+    tmp_path.mkdir(parents=True, exist_ok=True)
+    cache_file = tmp_path / "sales_analysis_page.pkl"
+    cache_file.write_bytes(b"stale")
+
+    cache_manager.clear_sales_cache()
+
+    assert not cache_file.exists()
+
+
 def test_cache_dicts_are_only_defined_in_cache_manager():
     assignments = []
     for path in [ROOT / "app.py", *ROOT.glob("routes/*.py"), *ROOT.glob("services/*.py")]: