def test_basic(self):

        test_file = os.path.join(sandbox, "test_SourceClip.aaf")

        f = aaf.open(None, 't')

        source_mob = f.create.SourceMob()
        f.storage.add_mob(source_mob)
        slot = source_mob.add_nil_ref(1, 100, "picture", "25/1")

        source_ref = aaf.util.SourceRef()
        source_ref.mob_id = source_mob.mobID
        source_ref.slot_id = slot.slotID
        source_ref.start_time = 10
        #source_ref.

        source_clip = f.create.SourceClip("picture", 10, source_ref)

        assert source_clip.source_ref.mob_id == source_mob.mobID
        print(source_clip.source_ref.slot_id)

        assert source_clip.source_ref.slot_id == slot.slotID

        s = str(source_clip.source_ref)

        #slot = source_clip.resolve_slot()

        assert source_clip.start_time == 10
        source_clip.start_time = 5
        assert source_clip.start_time == 5

        # this wont reslove unless sourclip is actually added to file
        #assert source_clip.resolve_ref() == source_mob