R Under development (unstable) (2024-02-27 r85995 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("RcppEigen", ncpu=getOption("Ncpus", 1))
+ }
starting worker pid=167116 on localhost:11797 at 14:46:57.409

test_RcppEigen.R..............   35 tests OK  13.5s

test_fastLm.R.................   24 tests OK  29ms

test_misc.R...................    7 tests OK  5ms

test_solution.R...............    8 tests OK  33.4s

test_sparse.R.................   10 tests OK  11.4s

test_transform.R..............    8 tests OK  7.9s

test_wrap.R...................   39 tests OK  14.0s [Exited at #97: Set 'RunLargeMemoryTests' to 'yes' to run.]
All ok, 131 results (1m 20.3s)
> 
> proc.time()
   user  system elapsed 
   0.20    0.10   80.76