R Under development (unstable) (2024-12-02 r87417 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> Sys.unsetenv("R_TESTS") # https://github.com/r-lib/testthat/issues/603
> 
> #options(Ncpus = 1)
> options(lifecycle_verbosity = "warning")
> #options(Ncpus = parallelly::availableCores(omit = 1))
> 
> test_check("breathteststan")
Loading required package: breathteststan
Loading required package: Rcpp
Starting 2 test processes
[ FAIL 0 | WARN 0 | SKIP 3 | PASS 27 ]

══ Skipped tests (3) ═══════════════════════════════════════════════════════════
• On CRAN (3): 'test_stan_fit_3.R:2:3', 'test_stan_fit_4.R:2:3',
  'test_stan_fit_5.R:2:3'

[ FAIL 0 | WARN 0 | SKIP 3 | PASS 27 ]
Warning message:
replacing previous import 'Rcpp::LdFlags' by 'RcppParallel::LdFlags' when loading 'breathteststan' 
> 
> proc.time()
   user  system elapsed 
   8.07    0.84   32.98