R Under development (unstable) (2023-08-05 r84874 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(nfl4th)
> 
> test_check("nfl4th")
[17:10:41] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:42] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:42] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:42] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:42] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:42] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:42] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:43] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:43] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:43] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:44] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:45] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:45] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:45] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:45] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[17:10:46] WARNING: src/learner.cc:553: 
  If you are loading a serialized model (like pickle in Python, RDS in R) generated by
  older XGBoost, please export the model by calling `Booster.save_model` from that version
  first, then load it back in current version. See:

    https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html

  for more details about differences between saving model and serializing.

[ FAIL 0 | WARN 0 | SKIP 0 | PASS 3 ]
> 
> proc.time()
   user  system elapsed 
   8.39    0.85    8.62