R Under development (unstable) (2023-10-21 r85382 ucrt) -- "Unsuffered Consequences"
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> if (require(testthat)) {
+   library(utf8)
+   test_check("utf8")
+ } else {
+   message("testthat not available.")
+ }
Loading required package: testthat
[ FAIL 0 | WARN 0 | SKIP 9 | PASS 159 ]

══ Skipped tests (9) ═══════════════════════════════════════════════════════════
• On CRAN (1): 'test-utf8_format.R:39:3'
• On Windows (8): 'test-utf8_encode.R:36:3', 'test-utf8_format.R:115:3',
  'test-utf8_format.R:154:3', 'test-utf8_format.R:187:3',
  'test-utf8_format.R:237:3', 'test-utf8_print.R:2:3',
  'test-utf8_print.R:416:3', 'test-utf8_width.R:15:3'

[ FAIL 0 | WARN 0 | SKIP 9 | PASS 159 ]
> 
> proc.time()
   user  system elapsed 
   2.18    0.18    2.36