R Under development (unstable) (2023-08-15 r84956 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(BIOMASS)
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)
Using temporary cache
  It is recommended to use a permanent cache to avoid to re-download files on each session.
  See function createCache() or BIOMASS.cache option.
> 
> test_check("BIOMASS")
pj_obj_create: Cannot find proj.db
pj_obj_create: Cannot find proj.db
pj_obj_create: Cannot find proj.db
pj_obj_create: Cannot find proj.db
pj_obj_create: Cannot find proj.db
pj_obj_create: Cannot find proj.db
pj_obj_create: Cannot find proj.db
pj_obj_create: Cannot find proj.db
trying URL 'https://github.com/umr-amap/BIOMASS/raw/master/data-raw/climate_variable/E.zip'
Content type 'application/zip' length 31208287 bytes (29.8 MB)
==================================================
downloaded 29.8 MB

pj_obj_create: Cannot find proj.db
[ FAIL 0 | WARN 8 | SKIP 0 | PASS 443 ]

[ FAIL 0 | WARN 8 | SKIP 0 | PASS 443 ]
> 
> proc.time()
   user  system elapsed 
  12.60    0.89   17.75