Tighten open helper constant usage guard

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

tests/test_file_message_default_constant_import_boundary.py

@@ -15,13 +15,15 @@
     "tests/test_extension_operation_metadata_usage.py",
     "tests/test_file_message_default_constant_import_boundary.py",
     "tests/test_file_message_default_constant_usage.py",
+    "tests/test_file_open_error_helper_usage.py",
 )
 
 EXPECTED_SESSION_DEFAULT_CONSTANT_CONSUMERS = (
     "hyperbrowser/client/managers/session_operation_metadata.py",
     "hyperbrowser/client/managers/session_upload_utils.py",
     "tests/test_file_message_default_constant_import_boundary.py",
     "tests/test_file_message_default_constant_usage.py",
+    "tests/test_file_open_error_helper_usage.py",
     "tests/test_session_operation_metadata.py",
     "tests/test_session_upload_metadata_usage.py",
 )

tests/test_file_open_error_helper_usage.py

@@ -6,15 +6,25 @@
 
 
 OPEN_ERROR_HELPER_MODULES = (
-    "hyperbrowser/client/managers/session_upload_utils.py",
-    "hyperbrowser/client/managers/sync_manager/extension.py",
-    "hyperbrowser/client/managers/async_manager/extension.py",
+    (
+        "hyperbrowser/client/managers/session_upload_utils.py",
+        "SESSION_DEFAULT_UPLOAD_OPEN_FILE_ERROR_PREFIX",
+    ),
+    (
+        "hyperbrowser/client/managers/sync_manager/extension.py",
+        "EXTENSION_DEFAULT_OPEN_FILE_ERROR_PREFIX",
+    ),
+    (
+        "hyperbrowser/client/managers/async_manager/extension.py",
+        "EXTENSION_DEFAULT_OPEN_FILE_ERROR_PREFIX",
+    ),
 )
 
 
 def test_file_open_error_messages_use_shared_helper():
-    for module_path in OPEN_ERROR_HELPER_MODULES:
+    for module_path, expected_default_constant in OPEN_ERROR_HELPER_MODULES:
         module_text = Path(module_path).read_text(encoding="utf-8")
         assert "build_open_file_error_message(" in module_text
+        assert expected_default_constant in module_text
         assert "default_prefix=" in module_text
         assert "open_error_message=f\"" not in module_text