R Under development (unstable) (2023-10-14 r85331 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(rstan)
Loading required package: StanHeaders

rstan version 2.32.3 (Stan version 2.26.1)

For execution on a local, multicore CPU with excess RAM we recommend calling
options(mc.cores = parallel::detectCores()).
To avoid recompilation of unchanged Stan programs, we recommend calling
rstan_options(auto_write = TRUE)
For within-chain threading using `reduce_sum()` or `map_rect()` Stan functions,
change `threads_per_chain` option:
rstan_options(threads_per_chain = 1)

Do not specify '-march=native' in 'LOCAL_CPPFLAGS' or a Makevars file
> 
> test_check("rstan")
Read 34 items
Read 34 items
Loading required namespace: Matrix
[ FAIL 0 | WARN 0 | SKIP 25 | PASS 149 ]

══ Skipped tests (25) ══════════════════════════════════════════════════════════
• Backwards compatibility (19): 'test-check_hmc_diagnostics.R:2:3',
  'test-loo_moment_matching.R:2:3', 'test-misc.R:2:3', 'test-misc.R:34:3',
  'test-partial_inits.R:2:3', 'test-read_stan_csv.R:17:3',
  'test-read_stan_csv.R:28:3', 'test-stan_args_hpp.R:20:3',
  'test-stan_args_hpp.R:35:3', 'test-stan_args_hpp.R:65:3',
  'test-stan_fun.R:44:3', 'test-stan_rdump.R:2:3', 'test-stan_rdump.R:18:3',
  'test-stanc.R:2:3', 'test-stanfit.R:2:3', 'test-stanfit.R:236:3',
  'test-stanfit_get.R:2:3', 'test-stanfit_get.R:22:3', 'test-stanmodel.R:2:3'
• Backwards compatibility + error (3): 'test-stanfit.R:103:3',
  'test-stanfit.R:128:3', 'test-stanfit.R:152:3'
• Backwards compatibility + failure (1): 'test-stanfit.R:177:3'
• Backwards compatibility + stan error (1): 'test-stan_fun.R:3:3'
• Need to add expectations (1): 'test-options.R:51:3'

[ FAIL 0 | WARN 0 | SKIP 25 | PASS 149 ]
> 
> proc.time()
   user  system elapsed 
   4.71    0.45    5.01