R Under development (unstable) (2025-08-18 r88641 ucrt) -- "Unsuffered Consequences"
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> library("testthat")
> test_check("rcrossref")
Loading required package: rcrossref
[ FAIL 0 | WARN 0 | SKIP 4 | PASS 310 ]

══ Skipped tests (4) ═══════════════════════════════════════════════════════════
• On CRAN (4): 'test-cr_abstract.R:1:1', 'test-cr_works.R:225:3',
  'test-cr_works_.R:97:3', 'test-id_converter.R:24:3'

[ FAIL 0 | WARN 0 | SKIP 4 | PASS 310 ]
> 
> proc.time()
   user  system elapsed 
  78.31    1.95   81.09