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  [20:16:44.946] [bbotk] Optimizer Error.
WARN  [20:16:58.084] [bbotk] Less then `n_select` (1) candidate points found during acquisition function optimization were not already evaluated.
WARN  [20:17:23.995] [bbotk] Task 'surrogate_task' has missing values in column(s) 'y_scal', but learner 'regr.km' does not support this
WARN  [20:17:23.996] [bbotk] Could not update the surrogate a final time after the optimization process has terminated.
WARN  [20:17:34.751] [bbotk] Task 'surrogate_task' has missing values in column(s) 'y_scal', but learner 'regr.km' does not support this
WARN  [20:17:34.752] [bbotk] Could not update the surrogate a final time after the optimization process has terminated.
WARN  [20:17:42.091] [bbotk] Surrogate Train Error.
WARN  [20:17:47.435] [bbotk] Current insample performance of the Surrogate Model does not meet the performance threshold.
WARN  [20:17:50.236] [bbotk] Surrogate Train Error.
WARN  [20:17:59.346] [bbotk] Current insample performance of the Surrogate Model does not meet the performance threshold.
WARN  [20:18:27.476] [bbotk] Current insample performance of the Surrogate Model does not meet the performance threshold.
WARN  [20:18:29.301] [bbotk] Optimizer Error.
WARN  [20:18:29.408] [bbotk] Surrogate Train Error.
WARN  [20:18:29.515] [bbotk] Surrogate Predict Error.
WARN  [20:18:56.876] [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 
  40.78    2.76  160.64