R Under development (unstable) (2023-09-30 r85239 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library(testthat)
> library(grf)
> 
> # This treats warnings as errors
> options(warn = 2)
> test_check("grf")
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 0 ]
> 
> proc.time()
   user  system elapsed 
   1.17    0.15    1.31