R Under development (unstable) (2023-12-13 r85679 ucrt) -- "Unsuffered Consequences"
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> library("testthat")
> library("bittermelon")

Attaching package: 'bittermelon'

The following object is masked from 'package:base':

    which

> 
> test_check("bittermelon")
[ FAIL 0 | WARN 0 | SKIP 20 | PASS 117 ]

══ Skipped tests (20) ══════════════════════════════════════════════════════════
• On CRAN (17): 'test-bm_bitmap.R:26:5', 'test-bm_list.R:47:5',
  'test-bm_list.R:105:5', 'test-bm_list.R:115:5', 'test-bm_list.R:132:5',
  'test-bm_list.R:149:5', 'test-bm_list.R:164:5', 'test-bm_list.R:175:5',
  'test-bm_trim.R:9:5', 'test-bm_trim.R:40:5', 'test-bm_trim.R:48:5',
  'test-bm_trim.R:55:5', 'test-bm_trim.R:68:5', 'test-bm_trim.R:73:5',
  'test-monobit.R:3:5', 'test-plot.bm_bitmap.R:9:5',
  'test-print.bm_bitmap.R:6:5'
• On Windows (3): 'test-bm_clamp.R:2:5', 'test-bm_extend.R:36:5',
  'test-hex.R:35:5'

[ FAIL 0 | WARN 0 | SKIP 20 | PASS 117 ]
> 
> proc.time()
   user  system elapsed 
  44.67    1.76   46.87