R version 4.6.0 RC (2026-04-20 r89921 ucrt) -- "Because it was There"
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> library(testthat)
> library(harmony)
Loading required package: Rcpp
• This is Harmony2 version 2.0.1
• Read the guide: run vignette()
• Get help: Visit the website at https://korsunskylab.github.io/harmony2/ and
report issues on https://github.com/immunogenomics/harmony/issues
> 
> test_check("harmony")
Saving _problems/test_integration-7.R
[ FAIL 1 | WARN 0 | SKIP 0 | PASS 0 ]

══ Failed tests ════════════════════════════════════════════════════════════════
── Error ('test_integration.R:5:1'): (code run outside of `test_that()`) ───────
<std::out_of_range/C++Error/error/condition>
Error: Mat::elem(): index out of bounds
Backtrace:
    ▆
 1. ├─harmony::RunHarmony(...) at test_integration.R:5:1
 2. └─harmony:::RunHarmony.default(...)
 3.   ├─base::tryCatch(...)
 4.   │ └─base (local) tryCatchList(expr, classes, parentenv, handlers)
 5.   └─harmonyObj$init_cluster_cpp()

[ FAIL 1 | WARN 0 | SKIP 0 | PASS 0 ]
Error:
! Test failures.
Execution halted