Remove unneeded assert, rollback session, and include fixture teardown

tests/test_database.py

@@ -7,10 +7,13 @@ import sqlalchemy.orm
 import data.database as db
 
 
-@fixture
+@fixture(scope='session')
 def db_session() -> db.dal.Session:
     db.dal.connect()
-    return db.dal.Session()
+    yield db.dal.Session()
+    if hasattr(db.dal, 'engine') and db.dal.engine:
+        db.dal.engine.dispose()
+        db.dal.engine.pool.recreate()
 
 
 def test_base() -> None:
@@ -49,10 +52,10 @@ def test_powerball_draw_integrity(db_session) -> None:
         try:
             session.add(draw)
             session.commit()
-            assert False
         except IntegrityError:
             assert True
         finally:
+            session.rollback()
             session.close()