fix mypy

Author: tswast

bigframes/session/_io/bigquery/read_gbq_table.py

@@ -60,6 +60,14 @@ def _convert_information_schema_table_id_to_table_reference(
     else:
         project = ".".join(parts[:dataset_index])
 
+    if project is None:
+        message = (
+            "Could not determine project ID. "
+            "Please provide a project or region in your INFORMATION_SCHEMA table ID, "
+            "For example, 'region-REGION_NAME.INFORMATION_SCHEMA.JOBS'."
+        )
+        raise ValueError(message)
+
     dataset = "INFORMATION_SCHEMA"
     table_id_short = ".".join(parts[dataset_index + 1 :])
     return bigquery.TableReference(

tests/unit/session/test_session.py

@@ -242,7 +242,7 @@ def test_read_gbq_cached_table():
     table._properties["numRows"] = "1000000000"
     table._properties["location"] = session._location
     table._properties["type"] = "TABLE"
-    session._loader._df_snapshot[table_ref] = (
+    session._loader._df_snapshot[str(table_ref)] = (
         datetime.datetime(1999, 1, 2, 3, 4, 5, 678901, tzinfo=datetime.timezone.utc),
         table,
     )