#NEWLINE# def test_best_prefix_SI_default( self ) : #NEWLINE# #INDENT# 'SI: Best prefix uses the current system if no preference set\n\nStart with a SI unit and assert no preference. The default behavior\nreturns a prefix from the current system family (GB)' #NEWLINE# should_be_GB = bitmath . MB ( 1000 ) . best_prefix ( ) #NEWLINE# self . assertIs ( type ( should_be_GB ) , bitmath . GB )