Assert on the StorePurchaseStatus enum translation

Tests in the future would catch if more status are added to that enum,
forcing us to review and update.

storeapi/base/impl/StoreContext.cpp

@@ -116,10 +116,11 @@ PurchaseStatus translate(StorePurchaseStatus purchaseStatus) noexcept {
     case StorePurchaseStatus::ServerError:
       return PurchaseStatus::ServerError;
   }
+  debug_assert(false, "Missing enum elements to translate StorePurchaseStatus.");
   return StoreApi::PurchaseStatus::Unknown;  // To be future proof.
 }
 }  // namespace
 
 }  // namespace StoreApi::impl
 
-#endif // UP4W_TEST_WITH_MS_STORE_MOCK
+#endif // UP4W_TEST_WITH_MS_STORE_MOCK