R Under development (unstable) (2023-07-13 r84688 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.
--------------------
The legacy packages maptools, rgdal, and rgeos, underpinning the sp package,
which was just loaded, will retire in October 2023.
Please refer to R-spatial evolution reports for details, especially
https://r-spatial.org/r/2023/05/15/evolution4.html.
It may be desirable to make the sf package available;
package maintainers should consider adding sf to Suggests:.
The sp package is now running under evolution status 2
     (status 2 uses the sf package in place of rgdal)
A slendr Python (3.11) environment with the necessary versions of
msprime (1.2.0), tskit (0.5.5), and pyslim (1.0.3) 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 31 | PASS 173 ]

══ Skipped tests (31) ══════════════════════════════════════════════════════════
• !is_slendr_env_present() is TRUE (31): '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'

[ FAIL 0 | WARN 0 | SKIP 31 | PASS 173 ]
> 
> proc.time()
   user  system elapsed 
  36.06    2.56  128.34