R Under development (unstable) (2024-03-16 r86144 ucrt) -- "Unsuffered Consequences"
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> if (requireNamespace("testthat", quietly = TRUE)) {
+   library("checkmate")
+   library("testthat")
+   library("mlr3")
+   library("mlr3cluster")
+   test_check("mlr3cluster")
+ }
 Setting default kernel parameters  
Using automatic sigma estimation (sigest) for RBF or laplace kernel 
 Setting default kernel parameters  
[ FAIL 0 | WARN 13 | SKIP 5 | PASS 1721 ]

══ Skipped tests (5) ═══════════════════════════════════════════════════════════
• On CRAN (5): 'test_mlr_learners_clust_cobweb.R:2:1',
  'test_mlr_learners_clust_em.R:2:1', 'test_mlr_learners_clust_ff.R:2:1',
  'test_mlr_learners_clust_simplekmeans.R:2:1',
  'test_mlr_learners_clust_xmeans.R:1:1'

[ FAIL 0 | WARN 13 | SKIP 5 | PASS 1721 ]
> 
> proc.time()
   user  system elapsed 
   9.42    0.98    9.57