R Under development (unstable) (2023-09-23 r85215 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(brms)
Loading required package: Rcpp
Loading 'brms' package (version 2.20.4). Useful instructions
can be found by typing help('brms'). A more detailed introduction
to the package is available through vignette('brms_overview').

Attaching package: 'brms'

The following object is masked from 'package:stats':

    ar

> 
> test_check("brms")
[ FAIL 0 | WARN 0 | SKIP 10 | PASS 2639 ]

══ Skipped tests (10) ══════════════════════════════════════════════════════════
• On CRAN (7): 'tests.brm.R:6:3', 'tests.brm.R:26:3',
  'tests.brmsfit-methods.R:4:1', 'tests.emmeans.R:3:1',
  'tests.make_stancode.R:2445:3', 'tests.make_stancode.R:2521:3',
  'tests.posterior_epred.R:4:1'
• exists("new_stan_functions", asNamespace("brms")) is not TRUE (1):
  'tests.stan_functions.R:5:3'
• not run by default (1): 'tests.read_csv_as_stanfit.R:2:1'
• skip as long as RWiener fails on R-devel for 3.6.0 (1):
  'tests.posterior_predict.R:383:3'

[ FAIL 0 | WARN 0 | SKIP 10 | PASS 2639 ]
> 
> proc.time()
   user  system elapsed 
 121.35    2.92  124.40