R Under development (unstable) (2024-06-24 r86823 ucrt) -- "Unsuffered Consequences"
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> library("testthat")
> library("bittermelon")
> 
> test_check("bittermelon")
[ FAIL 0 | WARN 0 | SKIP 41 | PASS 224 ]

══ Skipped tests (41) ══════════════════════════════════════════════════════════
• On CRAN (40): 'test-bm_bitmap.R:28:5', 'test-bm_clamp.R:49:5',
  'test-bm_distort.R:68:5', 'test-bm_expand.R:21:5', 'test-bm_extend.R:39:5',
  'test-bm_extend.R:82:5', 'test-bm_extend.R:99:5', 'test-bm_extend.R:119:5',
  'test-bm_extend.R:140:5', 'test-bm_flip.R:19:5', 'test-bm_gray.R:14:5',
  'test-bm_invert.R:14:5', 'test-bm_list.R:49:5', 'test-bm_list.R:108:5',
  'test-bm_list.R:115:5', 'test-bm_list.R:134:5', 'test-bm_list.R:151:5',
  'test-bm_list.R:164:5', 'test-bm_mask.R:35:5', 'test-bm_outline.R:18:5',
  'test-bm_overlay.R:30:5', 'test-bm_overlay.R:73:5', 'test-bm_pad.R:56:5',
  'test-bm_pixmap.R:58:5', 'test-bm_replace.R:17:5', 'test-bm_shift.R:17:5',
  'test-bm_trim.R:11:5', 'test-bm_trim.R:46:5', 'test-bm_trim.R:62:5',
  'test-bm_trim.R:83:5', 'test-bm_trim.R:103:5', 'test-bm_trim.R:121:5',
  'test-bm_trim.R:130:5', 'test-bm_trim.R:144:5', 'test-gridpattern.R:3:5',
  'test-hex.R:38:5', 'test-plot.R:9:5', 'test-plot.R:16:5',
  'test-print.bm_bitmap.R:8:5', 'test-print.bm_pixmap.R:17:5'
• Sys.which("monobit-convert") != "" is not TRUE (1): 'test-monobit.R:2:5'

[ FAIL 0 | WARN 0 | SKIP 41 | PASS 224 ]
> 
> proc.time()
   user  system elapsed 
  48.28    2.53   50.20