def METHOD_NAME(self, universe):
    trj = universe.trajectory
    trj.next()
    trj.next()  # for readers that do not support indexing
    assert_equal(trj.ts.frame, 2,
                 "failed to forward to frame 2 (frameindex 2)")
    trj.rewind()
    assert_equal(trj.ts.frame, 0, "failed to rewind to first frame")
    assert np.any(universe.atoms.positions > 0), "Reader does not " \
                                                 "populate positions after rewinding."