R Under development (unstable) (2024-09-01 r87083 ucrt) -- "Unsuffered Consequences"
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> if (requireNamespace("tinytest", quietly=TRUE)) {
+   if (length(unclass(packageVersion("grpreg"))[[1]]) == 4 | Sys.getenv('R_FORCE_TEST') == 'TRUE') {
+     tinytest::test_package("grpreg", pattern="^[^_].*\\.[rR]$")
+   }
+ }
> 
> proc.time()
   user  system elapsed 
   0.25    0.03    0.26