R version 4.5.0 RC (2025-04-04 r88118 ucrt) -- "How About a Twenty-Six"
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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(SUMO)
> 
> test_check("SUMO")
[ FAIL 1 | WARN 0 | SKIP 0 | PASS 16 ]

══ Failed tests ════════════════════════════════════════════════════════════════
── Error ('test-plot_weights.R:16:3'): plot_weights runs without error ─────────
Error in `gtable_add_grob(gt, grobs, t = positions$t, b = positions$b, 
    l = positions$l, r = positions$r, z = seq_along(grobs), clip = clip)`: `grobs` must be a single grob or a list of grobs, not a list.
Backtrace:
     ▆
  1. ├─testthat::expect_silent(...) at test-plot_weights.R:16:3
  2. │ └─testthat:::quasi_capture(enquo(object), NULL, evaluate_promise)
  3. │   ├─testthat (local) .capture(...)
  4. │   │ ├─withr::with_output_sink(...)
  5. │   │ │ └─base::force(code)
  6. │   │ ├─base::withCallingHandlers(...)
  7. │   │ └─base::withVisible(code)
  8. │   └─rlang::eval_bare(quo_get_expr(.quo), quo_get_env(.quo))
  9. └─SUMO::plot_weights(...)
 10.   ├─base::do.call(gridExtra::grid.arrange, c(plot_list, ncol = length(plot_list)))
 11.   └─gridExtra (local) `<fn>`(NULL, `<gg>`, ncol = 2L)
 12.     └─gridExtra::arrangeGrob(...)
 13.       └─gtable::gtable_add_grob(grobs = grobs)
 14.         └─gtable:::stop_input_type(grobs, "a single grob or a list of grobs")
 15.           └─rlang::abort(message, ..., call = call, arg = arg)

[ FAIL 1 | WARN 0 | SKIP 0 | PASS 16 ]
Error: Test failures
Execution halted