R Under development (unstable) (2026-02-01 r89366 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(mlpack)

Attaching package: 'mlpack'

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

    kmeans

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

    det

> 
> test_check("mlpack")
[FATAL] When passing labels from R to mlpack, labels should be in the range from 1 to the number of classes!

[INFO ] Using reference data from 5x10 matrix.
[INFO ] Building reference tree...
[INFO ] Tree built.
[INFO ] Using query data from 5x10 matrix.
[INFO ] Searching for 3 neighbors with dual-tree kd-tree search...
[INFO ] 11 node combinations were scored.
[INFO ] 100 base cases were calculated.
[INFO ] 11 node combinations were scored.
[INFO ] 100 base cases were calculated.
[INFO ] Search complete.
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 1551 ]
> 
> proc.time()
   user  system elapsed 
   6.25    1.06    7.29