anchor.diff:  
     preCheck = ''
       export HOME="$TMPDIR"
  -    cd tests
   
       # This test requires the nlp module, which we haven't
       # packaged yet. However, nlp is optional for transformers
       # itself
  -    rm test_trainer.py
  +    rm tests/test_trainer.py
     '';
  +
  +  # We have to run from the main directory for the tests. However,
  +  # letting pytest discover tests leads to errors.
  +  pytestFlagsArray = [ "tests" ];
   
     # Disable tests that require network access.
     disabledTests = [
  
positive.code: , regex
  , requests
  , numpy
  , sacremoses
  , sentencepiece
  , timeout-decorator
  
negative.code:     "test_tokenizer_from_model_type"
      "test_tokenizer_from_model_type"
      "test_tokenizer_from_pretrained"
      "test_tokenizer_from_tokenizer_class"
      "test_tokenizer_identifier_with_correct_config"
    ];
  
  