build 042: remove MarketPriceCache compatibility facade

app/tests/unit/storage/test_quote_store.py

@@ -10,9 +10,12 @@ import pytest
 
 from src.market_data.acquisition.models.quote import Quote
 from src.storage.exceptions import QuoteStoreError, StorageError
+import src.storage.quote_store as quote_store_module
 from src.storage.quote_store import (
     InMemoryQuoteStore,
+    QUOTE_RUNTIME_SOURCE_NAME,
     QuoteStoreProtocol,
+    get_quote_store,
 )
 
 
@@ -446,3 +449,31 @@ def test_quote_store_error_inherits_storage_error() -> None:
     error = QuoteStoreError("test")
 
     assert isinstance(error, StorageError)
+
+
+
+
+def test_shared_quote_store_matches_protocol() -> None:
+    assert isinstance(get_quote_store(), QuoteStoreProtocol)
+
+
+def test_shared_quote_store_returns_same_instance() -> None:
+    assert get_quote_store() is get_quote_store()
+
+
+def test_runtime_source_name_preserves_compatibility_namespace() -> None:
+    assert QUOTE_RUNTIME_SOURCE_NAME == "legacy-market-price-cache"
+
+
+def test_shared_quote_store_can_be_replaced_in_test(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    replacement = InMemoryQuoteStore()
+
+    monkeypatch.setattr(
+        quote_store_module,
+        "_SHARED_QUOTE_STORE",
+        replacement,
+    )
+
+    assert get_quote_store() is replacement