def test_dbnull():
 if is_netstandard:
  clr.AddReference('System.Data.Common')
 if System.DBNull.Value:
  AssertUnreachable()

def test_dbnull ( ) : if is_netstandard : clr . AddReference ( 'System.Data.Common' ) if System . DBNull . Value : AssertUnreachable ( )
dbnull should not be true .