R Under development (unstable) (2023-12-09 r85665 ucrt) -- "Unsuffered Consequences"
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> 
> if (file.exists("async") && Sys.getenv("NOT_CRAN") == "true") {
+   library(testthat)
+   library(pkgcache)
+   print(sessioninfo::package_info("pkgcache", dependencies = TRUE))
+ 
+   test_dir(
+     "async",
+     env = new.env(parent = asNamespace("pkgcache")),
+     reporter = "summary"
+   )
+ }
> 
> proc.time()
   user  system elapsed 
   0.12    0.03    0.14