R Under development (unstable) (2024-02-29 r86017 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  [13:25:43.447] [bbotk] Optimizer Error.
WARN  [13:26:02.699] [bbotk] Less then `n_select` (1) candidate points found during acquisition function optimization were not already evaluated.
WARN  [13:26:39.867] [bbotk] Task 'surrogate_task' has missing values in column(s) 'y_scal', but learner 'regr.km' does not support this
WARN  [13:26:39.868] [bbotk] Could not update the surrogate a final time after the optimization process has terminated.
WARN  [13:26:56.116] [bbotk] Task 'surrogate_task' has missing values in column(s) 'y_scal', but learner 'regr.km' does not support this
WARN  [13:26:56.118] [bbotk] Could not update the surrogate a final time after the optimization process has terminated.
WARN  [13:27:06.976] [bbotk] Surrogate Train Error.
WARN  [13:27:14.483] [bbotk] Current insample performance of the Surrogate Model does not meet the performance threshold.
WARN  [13:27:18.456] [bbotk] Surrogate Train Error.
WARN  [13:27:31.366] [bbotk] Current insample performance of the Surrogate Model does not meet the performance threshold.
WARN  [13:28:09.460] [bbotk] Current insample performance of the Surrogate Model does not meet the performance threshold.
WARN  [13:28:11.963] [bbotk] Optimizer Error.
WARN  [13:28:12.135] [bbotk] Surrogate Train Error.
WARN  [13:28:12.305] [bbotk] Surrogate Predict Error.
WARN  [13:28:53.097] [bbotk] Cannot predict, Learner 'regr.error' has not been trained yet
[ FAIL 0 | WARN 0 | SKIP 4 | PASS 889 ]

══ Skipped tests (4) ═══════════════════════════════════════════════════════════
• On CRAN (4): 'test_AcqFunctionEHVIGH.R:32:3', 'test_OptimizerMbo.R:2:3',
  'test_ResultAssignerSurrogate.R:16:3', 'test_TunerMbo.R:2:3'

[ FAIL 0 | WARN 0 | SKIP 4 | PASS 889 ]
> 
> proc.time()
   user  system elapsed 
  58.64    3.90  230.18