tests: use 'test_must_be_empty' instead of 'test_cmp <empty> <out>'

[git] / t / t4034 / bibtex / pre

@article{aldous1987uie,
  title={{Ultimate instability of exponential back-off protocol for acknowledgment-based transmission control of random access communication channels}},
  author={Aldous, D.},
  journal={Information Theory, IEEE Transactions on},
  volume={33},
  number={2},
  pages={219--223},
  year={1987},
}