R Under development (unstable) (2023-08-16 r84968 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(fmesher)
The legacy packages maptools, rgdal, and rgeos, underpinning the sp package,
which was just loaded, will retire in October 2023.
Please refer to R-spatial evolution reports for details, especially
https://r-spatial.org/r/2023/05/15/evolution4.html.
It may be desirable to make the sf package available;
package maintainers should consider adding sf to Suggests:.
The sp package is now running under evolution status 2
     (status 2 uses the sf package in place of rgdal)
> 
> test_check("fmesher")
Starting 2 test processes
[ FAIL 0 | WARN 0 | SKIP 9 | PASS 184 ]

══ Skipped tests (9) ═══════════════════════════════════════════════════════════
• On CRAN (9): 'test-fmesher_pixels.R:2:3', 'test-fmesher_transform.R:2:3',
  'test-fmesher_transform.R:28:3', 'test-fmesher_transform.R:62:3',
  'test-fmesher_transform.R:90:3', 'test-fmesher_integration.R:242:3',
  'test-fmesher_integration.R:253:3', 'test-fmesher_integration.R:290:3',
  'test-fmesher_integration.R:318:3'

[ FAIL 0 | WARN 0 | SKIP 9 | PASS 184 ]
> 
> proc.time()
   user  system elapsed 
   3.40    0.35    8.01