R Under development (unstable) (2025-06-15 r88316 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(thematic)
> 
> test_check("thematic")
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
[ FAIL 0 | WARN 5 | SKIP 16 | PASS 27 ]

══ Skipped tests (16) ══════════════════════════════════════════════════════════
• On CRAN (13): 'test-base.R:6:3', 'test-ggplot.R:29:3', 'test-ggplot.R:147:3',
  'test-ggplot.R:223:3', 'test-ggthemes.R:10:3', 'test-ggthemes.R:25:3',
  'test-ggthemes.R:54:3', 'test-lattice.R:13:3',
  'test-sequential-gradient.R:12:3', 'test-shinytest.R:1:1',
  'test-state.R:4:3', 'test-state.R:26:3', 'test-state.R:42:3'
• {gridExtra} is not installed (1): 'test-ggplot.R:200:3'
• {patchwork} is not installed (1): 'test-ggplot.R:211:3'
• {rgdal} is not installed (1): 'test-ggplot.R:175:3'

[ FAIL 0 | WARN 5 | SKIP 16 | PASS 27 ]
> 
> proc.time()
   user  system elapsed 
  11.60    1.17   13.17