R Under development (unstable) (2026-03-26 r89724 ucrt) -- "Unsuffered Consequences"
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> # This file is part of the standard setup for testthat.
> # It is recommended that you do not modify it.
> #
> # Where should you do additional test configuration?
> # Learn more about the roles of various files in:
> # * https://r-pkgs.org/testing-design.html#sec-tests-files-overview
> # * https://testthat.r-lib.org/articles/special-files.html
> 
> library(testthat)
> library(findn)
> 
> test_check("findn")
Saving _problems/test-print.findn-18.R
[ FAIL 1 | WARN 0 | SKIP 0 | PASS 29 ]

══ Failed tests ════════════════════════════════════════════════════════════════
── Error ('test-print.findn.R:17:3'): plot.findn works ─────────────────────────
Error in `sqrt(new_n)`: non-numeric argument to mathematical function
Backtrace:
    ▆
 1. └─findn:::predict_fit(...) at test-print.findn.R:17:3
 2.   └─base::cbind(1, sqrt(new_n))

[ FAIL 1 | WARN 0 | SKIP 0 | PASS 29 ]
Error:
! Test failures.
Execution halted