#NEWLINE# def _assert_is_empty_tile( self , response ) : #NEWLINE# #INDENT# im = Image . open ( BytesIO ( response . content ) ) #NEWLINE# stats = im . getextrema ( ) #NEWLINE# zero_rgba = ( ( 0 , 0 ) , ( 0 , 0 ) , ( 0 , 0 ) , ( 0 , 0 ) ) #NEWLINE# self . assertEqual ( stats , zero_rgba )