R Under development (unstable) (2024-01-12 r85803 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> Sys.unsetenv("R_TESTS") # https://github.com/r-lib/testthat/issues/603
> options(Ncpus = parallelly::availableCores(omit = 1))
> 
> test_check("breathteststan")
Loading required package: breathteststan
Loading required package: Rcpp
Starting 1 test process
[ 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 ]
> 
> proc.time()
   user  system elapsed 
   5.17    0.37   27.78