R Under development (unstable) (2023-06-03 r84490 ucrt) -- "Unsuffered Consequences"
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> if (requireNamespace("testthat", quietly = TRUE)) {
+   library(testthat)
+   library(mlr3mbo)
+   test_check("mlr3mbo")
+ }
Loading required namespace: mlr3learners
Loading required namespace: DiceKriging
Loading required namespace: rgenoud
Loading required package: mlr3
WARN  [11:42:23.890] [bbotk] Optimizer Error.
WARN  [11:42:36.701] [bbotk] All candidates were already evaluated.
WARN  [11:43:30.490] [bbotk] Surrogate Train Error.
WARN  [11:43:38.010] [bbotk] Current insample performance of the Surrogate Model does not meet the performance threshold.
WARN  [11:43:41.705] [bbotk] Surrogate Train Error.
WARN  [11:43:53.659] [bbotk] Current insample performance of the Surrogate Model does not meet the performance threshold.
WARN  [11:44:31.453] [bbotk] Current insample performance of the Surrogate Model does not meet the performance threshold.
WARN  [11:44:33.785] [bbotk] Optimizer Error.
WARN  [11:44:33.941] [bbotk] Surrogate Train Error.
WARN  [11:44:34.121] [bbotk] Surrogate Predict Error.
WARN  [11:45:13.374] [bbotk] Cannot predict, Learner 'regr.error' has not been trained yet
[ FAIL 0 | WARN 0 | SKIP 4 | PASS 872 ]

══ Skipped tests ═══════════════════════════════════════════════════════════════
• On CRAN (4)

[ FAIL 0 | WARN 0 | SKIP 4 | PASS 872 ]
> 
> proc.time()
   user  system elapsed 
  53.92    3.34  207.29