R CMD check found ERRORs

there is no package called 'testthat'

Process completed with exit code 1.

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, r-lib/actions/setup-r@f57f1301a053485946083d7a45022b278929a78a. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: r-lib/actions/setup-r@f57f1301a053485946083d7a45022b278929a78a. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Found the following significant warnings:

Undocumented code objects:

Undocumented arguments in documentation object 'bleu_corpus_ids'

'library' or 'require' call not declared from: 'testthat'

See below...

Undocumented code objects:

Undocumented arguments in documentation object 'bleu_corpus_ids'