perf(sqlalchemy-bigquery): reuse session-scoped engine in system geography tests

Author: ohmayr

packages/sqlalchemy-bigquery/tests/system/test_geography.py

@@ -24,7 +24,7 @@
 
 # TODO(http://github.com/googleapis/google-cloud-python/issues/17287): Unskip once bug is resolved.
 @pytest.mark.skip(reason="Failing in CI with AssertionError.")
-def test_geoalchemy2_core(bigquery_dataset):
+def test_geoalchemy2_core(engine, bigquery_dataset):
     """Make sure GeoAlchemy 2 Core Tutorial works as adapted to only having geography
 
     https://geoalchemy-2.readthedocs.io/en/latest/core_tutorial.html
@@ -34,12 +34,6 @@ def test_geoalchemy2_core(bigquery_dataset):
     - Bigquery doesn't have ST_BUFFER
     """
 
-    # Connect to the DB
-
-    from sqlalchemy import create_engine
-
-    engine = create_engine(f"bigquery:///{bigquery_dataset}")
-
     # Create the Table
 
     from sqlalchemy import Column, MetaData, String, Table
@@ -143,18 +137,12 @@ def test_geoalchemy2_core(bigquery_dataset):
 
 # TODO(http://github.com/googleapis/google-cloud-python/issues/17287): Unskip once bug is resolved.
 @pytest.mark.skip(reason="Failing in CI with AssertionError.")
-def test_geoalchemy2_orm(bigquery_dataset):
+def test_geoalchemy2_orm(engine, bigquery_dataset):
     """Make sure GeoAlchemy 2 ORM Tutorial works as adapted to only having geometry
 
     https://geoalchemy-2.readthedocs.io/en/latest/orm_tutorial.html
     """
 
-    # Connect to the DB
-
-    from sqlalchemy import create_engine
-
-    engine = create_engine(f"bigquery:///{bigquery_dataset}")
-
     # Declare a Mapping
 
     from sqlalchemy import Column, Integer, String
@@ -260,10 +248,7 @@ class Lake(Base):
 
 # TODO(http://github.com/googleapis/google-cloud-python/issues/17287): Unskip once bug is resolved.
 @pytest.mark.skip(reason="Failing in CI with AssertionError.")
-def test_geoalchemy2_orm_w_relationship(bigquery_dataset):
-    from sqlalchemy import create_engine
-
-    engine = create_engine(f"bigquery:///{bigquery_dataset}")
+def test_geoalchemy2_orm_w_relationship(engine, bigquery_dataset):
 
     from sqlalchemy import Column, Integer, String
     from sqlalchemy.ext.declarative import declarative_base