R Under development (unstable) (2025-08-19 r88650 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(unfold)
> 
> test_check("unfold")
[ FAIL 3 | WARN 0 | SKIP 0 | PASS 0 ]

══ Failed tests ════════════════════════════════════════════════════════════════
── Error ('test-main.R:15:3'): unfold returns expected object structure ────────
<std::runtime_error/C++Error/error/condition>
Error in `torch_tensor_cpp(data, dtype, device, requires_grad, pin_memory)`: Lantern is not loaded. Please use `install_torch()` to install additional dependencies.
Backtrace:
    ▆
 1. └─unfold::unfold(...) at test-main.R:15:3
 2.   └─torch::torch_tensor(reframed_array)
 3.     └─Tensor$new(data, dtype, device, requires_grad, pin_memory)
 4.       └─methods$initialize(NULL, NULL, ...)
 5.         └─torch:::torch_tensor_cpp(...)
── Error ('test-main.R:30:3'): predictive functions exist and are callable ─────
<std::runtime_error/C++Error/error/condition>
Error in `torch_tensor_cpp(data, dtype, device, requires_grad, pin_memory)`: Lantern is not loaded. Please use `install_torch()` to install additional dependencies.
Backtrace:
    ▆
 1. └─unfold::unfold(...) at test-main.R:30:3
 2.   └─torch::torch_tensor(reframed_array)
 3.     └─Tensor$new(data, dtype, device, requires_grad, pin_memory)
 4.       └─methods$initialize(NULL, NULL, ...)
 5.         └─torch:::torch_tensor_cpp(...)
── Error ('test-main.R:43:3'): unfold is reproducible with fixed seed (within tolerance) ──
<std::runtime_error/C++Error/error/condition>
Error in `torch_tensor_cpp(data, dtype, device, requires_grad, pin_memory)`: Lantern is not loaded. Please use `install_torch()` to install additional dependencies.
Backtrace:
    ▆
 1. └─unfold::unfold(...) at test-main.R:43:3
 2.   └─torch::torch_tensor(reframed_array)
 3.     └─Tensor$new(data, dtype, device, requires_grad, pin_memory)
 4.       └─methods$initialize(NULL, NULL, ...)
 5.         └─torch:::torch_tensor_cpp(...)

[ FAIL 3 | WARN 0 | SKIP 0 | PASS 0 ]
Error: Test failures
Execution halted