R Under development (unstable) (2023-04-30 r84357 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64 (64-bit)

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> library(testthat)
> 
> local({
+ 
+   # Disable test on Windows, pending devtools
+   # compatibility with new toolchain
+   isWindows <- Sys.info()[["sysname"]] == "Windows"
+   if (isWindows)
+     return()
+ 
+   # Disable tests on Solaris, because we don't use Catch there.
+   isSolaris <- Sys.info()[["sysname"]] == "SunOS"
+   if (isSolaris)
+     return()
+ 
+   if (!requireNamespace("usethis", quietly = TRUE))
+     return()
+ 
+   # devel <- try(pkgbuild::has_compiler(), silent = TRUE)
+   # if (!isTRUE(devel))
+   #   return()
+ 
+   quietly <- function(expr) {
+     suppressMessages(capture_output(result <- expr))
+     result
+   }
+ 
+   perform_test <- function(pkgName, catchEnabled) {
+ 
+     owd <- setwd(tempdir())
+     on.exit(setwd(owd), add = TRUE)
+ 
+     pkgPath <- file.path(tempdir(), pkgName)
+     libPath <- file.path(tempdir(), "rlib")
+     if (!utils::file_test("-d", libPath))
+       dir.create(libPath)
+     .libPaths(c(libPath, .libPaths()))
+ 
+     on.exit({
+       unlink(pkgPath, recursive = TRUE)
+       unlink(libPath, recursive = TRUE)
+     }, add = TRUE)
+ 
+     quietly(usethis::create_package(pkgPath, open = FALSE))
+     quietly(testthat::use_catch(pkgPath))
+ 
+     cat("LinkingTo: testthat",
+         file = file.path(pkgPath, "DESCRIPTION"),
+         append = TRUE,
+         sep = "\n")
+ 
+     cat(
+       sprintf("useDynLib(%s, .registration=TRUE)", pkgName),
+       file = file.path(pkgPath, "NAMESPACE"),
+       append = TRUE,
+       sep = "\n"
+     )
+ 
+     if (!catchEnabled) {
+ 
+       makevarsPath <- file.path(
+         pkgPath,
+         "src",
+         if (isWindows) "Makevars.win" else "Makevars"
+       )
+ 
+       cat(
+         "PKG_CPPFLAGS = -DTESTTHAT_DISABLED",
+         file = makevarsPath,
+         sep = "\n"
+       )
+ 
+     }
+ 
+     install.packages(pkgs = pkgPath, repos = NULL, type = "source")
+     library(pkgName, character.only = TRUE)
+     stopifnot(.Call("run_testthat_tests", FALSE, PACKAGE = pkgName))
+     pkgload::unload(pkgName)
+   }
+ 
+   withr::with_envvar(c(R_TESTS = ''), perform_test("testthatclient1",  TRUE))
+   withr::with_envvar(c(R_TESTS = ''), perform_test("testthatclient2", FALSE))
+ })
NULL
> 
> proc.time()
   user  system elapsed 
   0.46    0.25    0.68