R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> 
> do <- function() {
+   old <- Sys.getenv("R_PKG_CACHE_DIR", NA_character_)
+   if (is.na(old)) {
+     on.exit(Sys.unsetenv("R_PKG_CACHE_DIR"), add = TRUE)
+   } else {
+     on.exit(Sys.setenv("R_PKG_CACHE_DIR" = old), add = TRUE)
+   }
+   Sys.setenv("R_PKG_CACHE_DIR" = tempfile())
+ 
+   library(pak)
+   library(testthat)
+   test_check("pak", reporter = "summary")
+ }
> 
> if (Sys.getenv("NOT_CRAN") == "true") {
+   do()
+ }
> 
> proc.time()
   user  system elapsed 
   0.12    0.03    0.14