def test_non_bijective(self):
        x = Bidict()
        x[1] = 2
        x[3] = 2
        del x[1]
        del x[3]
Returns a new instance of MimeWriter which represents an
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/data_structures/bijectivedict.py/TestBidict.test_non_bijective--crossover with--dataset/ETHPy150Open Southpaw-TACTIC/TACTIC/src/context/client/tactic-api-python-4.0.api04/Lib/MimeWriter.py/MimeWriter.nextpart