R Under development (unstable) (2023-08-20 r84995 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(rnaturalearth)
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)
Support for Spatial objects (`sp`) will be deprecated in {rnaturalearth} and will be removed in a future release of the package. Please use `sf` objects with {rnaturalearth}. For example: `ne_download(returnclass = 'sf')`
> 
> test_check("rnaturalearth")
[ FAIL 0 | WARN 1 | SKIP 6 | PASS 15 ]

══ Skipped tests (6) ═══════════════════════════════════════════════════════════
• On CRAN (2): 'test-ne_file_name.r:28:3', 'test-ne_file_name.r:36:3'
• rnaturalearthhires cannot be loaded (4): 'test-ne_states.r:8:3',
  'test-ne_states.r:20:3', 'test-ne_states.r:37:3', 'test-ne_states.r:54:3'

[ FAIL 0 | WARN 1 | SKIP 6 | PASS 15 ]
> 
> proc.time()
   user  system elapsed 
   2.48    0.34    2.81