#NEWLINE# @ implementation #NEWLINE# def test_add_remove_activity_by_id( self ) : #NEWLINE# #INDENT# self . feed_cls . insert_activity ( self . activity ) #NEWLINE# self . feed_cls . remove_activity ( self . activity . serialization_id ) #NEWLINE# activity = self . test_feed . activity_storage . get ( self . activity . serialization_id ) #NEWLINE# assert ( activity is None )