R Under development (unstable) (2023-11-30 r85651 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(bookdown)
> 
> test_check("bookdown")
[ FAIL 0 | WARN 0 | SKIP 11 | PASS 82 ]

══ Skipped tests (11) ══════════════════════════════════════════════════════════
• On CRAN (10): 'test-ebook.R:2:3', 'test-gitbook.R:2:3',
  'test-gitbook.R:21:3', 'test-gitbook.R:44:3', 'test-html.R:2:3',
  'test-html.R:16:3', 'test-html.R:30:3', 'test-html.R:68:3',
  'test-skeleton.R:59:3', 'test-skeleton.R:67:3'
• xfun::is_linux() is not TRUE (1): 'test-utils.R:32:3'

[ FAIL 0 | WARN 0 | SKIP 11 | PASS 82 ]
> 
> proc.time()
   user  system elapsed 
   4.48    0.87   10.04