R Under development (unstable) (2026-03-04 r89536 ucrt) -- "Unsuffered Consequences"
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> 
> if (requireNamespace("tinytest", quietly=TRUE) &&
+     utils::packageVersion("tinytest") >= "1.0.0") {
+ 
+     ## Set a seed to make the test deterministic
+     set.seed(42)
+ 
+     ## R makes us to this
+     Sys.setenv("R_TESTS"="")
+ 
+     ## there are several more granular ways to test files in a tinytest directory,
+     ## see its package vignette; tests can also run once the package is installed
+     ## using the same command `test_package(pkgName)`, or by director or file
+     tinytest::test_package("RcppGSL", ncpu=getOption("Ncpus", 1))
+ }
starting worker pid=85792 on localhost:11476 at 15:51:16.639

test_client_package.R.........    0 tests     47ms [Exited at #28: Skip client package test on Windows without LIB_GSL]

test_fastLm.R.................   25 tests OK  23ms

test_gsl.R....................   16 tests OK  6.5s
All ok, 41 results (6.6s)
> 
> proc.time()
   user  system elapsed 
   0.10    0.09    7.04