#NEWLINE# def test_difference( self ) : #NEWLINE# #INDENT# result = _ . difference ( [ 1 , 2 , 3 ] , [ 2 , 30 , 40 ] ) #NEWLINE# self . assertEqual ( [ 1 , 3 ] , self , 'takes the difference of two arrays' ) #NEWLINE# result = _ . difference ( [ 1 , 2 , 3 , 4 ] , [ 2 , 30 , 40 ] , [ 1 , 11 , 111 ] ) #NEWLINE# self . assertEqual ( [ 3 , 4 ] , result , 'takes the difference of three arrays' )