R Under development (unstable) (2023-11-02 r85465 ucrt) -- "Unsuffered Consequences"
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> if (base::require("testthat", quietly = TRUE)) {
+     pkg   <- "lme4"
+     require(pkg, character.only=TRUE, quietly=TRUE)
+     if(getRversion() < "3.5.0") { withAutoprint <- identity ; prt <- print } else { prt <- identity }
+     if(Sys.getenv("USER") %in% c("maechler", "bbolker")) withAutoprint({
+         ## for developers' sake:
+         lP <- .libPaths() # ---- .libPaths() : ----
+         prt(lP)
+         ## ---- Entries in .libPaths()[1] : ----
+         prt(list.files(lP[1], include.dirs=TRUE))
+         prt(sessionInfo())
+         prt(packageDescription("Matrix"))
+         ## 'lme4' from packageDescription "file" :
+         prt(attr(packageDescription("lme4"), "file"))
+     })
+     test_check(pkg)
+     ##======== ^^^
+     print(warnings()) # TODO? catch most of these by expect_warning(..)
+ } else {
+     cat( "package 'testthat' not available, cannot run unit tests\n" )
+ }
[1] 0.05
~recipe
<environment: 0x00000287669b2f48>
[1] 0.05
NULL
[ FAIL 0 | WARN 2 | SKIP 1 | PASS 623 ]

══ Skipped tests (1) ═══════════════════════════════════════════════════════════
• On CRAN (1): 'test-eval.R:2:1'

[ FAIL 0 | WARN 2 | SKIP 1 | PASS 623 ]
> 
> proc.time()
   user  system elapsed 
  41.75    0.81   42.92