R Under development (unstable) (2024-01-14 r85805 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(slendr)
The 'slim' binary could not be found in your $PATH. Most of
the functionality of slendr will work without any issues but
you will not be able to simulate data with the `slim()` function.

If you want to run SLiM simulations, make sure to modify the $PATH
variable so that it points to the directory containing the slim
command-line program. One easy way to do this is to add this:

PATH="path/to/the/directory/with/slim/program"

to your ~/.Renviron file.
--------------------
A slendr Python (3.11) environment with the necessary versions of
msprime (1.2.0), tskit (0.5.6), pyslim (1.0.4), and tspop (0.0.2)
has not been found.

You can setup a pre-configured environment with all of slendr's Python
dependencies automatically by running the function `setup_env()`.
> 
> test_check("slendr")
[ FAIL 0 | WARN 0 | SKIP 32 | PASS 179 ]

══ Skipped tests (32) ══════════════════════════════════════════════════════════
• !is_slendr_env_present() is TRUE (32): 'test-compilation.R:65:1',
  'test-engines.R:1:1', 'test-geneflow.R:50:3', 'test-ibd-squashing.R:1:1',
  'test-ibd.R:1:1', 'test-interaction-changes.R:49:3', 'test-manual-ts.R:1:1',
  'test-msprime-geneflow.R:5:1', 'test-msprime-metadata.R:1:1',
  'test-msprime.R:23:1', 'test-nonserialized.R:1:1', 'test-population.R:43:3',
  'test-population.R:60:3', 'test-population.R:142:3',
  'test-pure-msprime-vs-slendr.R:4:1', 'test-pure-slim-vs-slendr.R:4:1',
  'test-resizes-locked.R:1:1', 'test-resizes.R:1:1', 'test-runners.R:1:1',
  'test-sampling.R:70:3', 'test-sampling.R:127:3', 'test-sampling.R:228:3',
  'test-sampling.R:254:3', 'test-sampling.R:287:3',
  'test-simulation-runs.R:1:1', 'test-time-direction.R:1:1',
  'test-trees.R:1:1', 'test-ts-ancestors-descendants.R:1:1',
  'test-ts-pure-nonspatial.R:1:1', 'test-ts-pure-spatial.R:1:1',
  'test-ts.R:1:1', 'test-tspop.R:1:1'

[ FAIL 0 | WARN 0 | SKIP 32 | PASS 179 ]
> 
> proc.time()
   user  system elapsed 
  73.93    6.01  236.46