R Under development (unstable) (2023-08-28 r85029 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(leaflet)
> 
> test_check("leaflet")
Linking to GEOS 3.11.2, GDAL 3.6.2, PROJ 9.2.0; sf_use_s2() is TRUE
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)
terra 1.7.39

Attaching package: 'terra'

The following objects are masked from 'package:testthat':

    compare, describe

[ FAIL 0 | WARN 0 | SKIP 3 | PASS 808 ]

══ Skipped tests (3) ═══════════════════════════════════════════════════════════
• On CRAN (3): 'test-normalize-2.R:124:3', 'test-remote.R:157:3',
  'test-remote.R:215:3'

[ FAIL 0 | WARN 0 | SKIP 3 | PASS 808 ]
> 
> proc.time()
   user  system elapsed 
   7.76    0.51    8.28