R Under development (unstable) (2023-04-30 r84357 ucrt) -- "Unsuffered Consequences"
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> if (Sys.getenv("_LOCAL_TESTS_")=="TRUE") { ## not on CRAN
+   if(require("testthat", quietly = TRUE)) {
+     pkg   <- "blackbox"
+     require(pkg, character.only=TRUE, quietly=TRUE)
+     ## test_package(pkg) ## for an installed package
+     if (interactive()) {
+       if (FALSE) { ## tests not included in package (using unpublished data, etc.)
+         oldpath <- getwd() 
+         ptpath <- paste0(blackbox::projpath(),"/package/tests_private/")
+         subpaths <- dir(ptpath,full.names = TRUE)
+         virgin_opts <- blackbox.options()
+         priv_timings <- list()
+         # the migraine scripts have rm(list=ls()) hence we copy some variable in the options 'keep_over_blackbox_tests' and 'blackbox_path'
+         options(keep_over_blackbox_tests=mget(c("oldpath","subpaths","virgin_opts","priv_timings"),.GlobalEnv))
+         for (st in getOption("keep_over_blackbox_tests")$subpaths) {
+           options("blackbox_path"=st)
+           setwd(st)
+           blackbox.options(getOption("keep_over_blackbox_tests")$virgin_opts)
+           priv_timing <- system.time(source("migraine_1.R"))
+           keep_over_blackbox_tests <- getOption("keep_over_blackbox_tests")
+           keep_over_blackbox_tests$priv_timings[[getOption("blackbox_path")]] <- priv_timing
+           options("keep_over_blackbox_tests"=keep_over_blackbox_tests)
+         }
+         setwd(getOption("keep_over_blackbox_tests")$oldpath)
+         #priv_testfiles <- dir(ptpath,pattern="*.R",full.names = TRUE)
+         #priv_timings <- t(sapply(priv_testfiles, function(fich){system.time(source(fich))}))
+         print(getOption("keep_over_blackbox_tests")$priv_timings)
+       }
+     } else {    
+       report <- test_check(pkg) ## for R CMD check ## report is NULL...
+       print(warnings()) # TODO? catch most of these by expect_warning(..)
+     }  
+   } else {
+     cat( "package 'testthat' not available, cannot run unit tests\n" )
+   }
+ }
> 
> proc.time()
   user  system elapsed 
   0.25    0.06    0.25