R Under development (unstable) (2024-01-23 r85822 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(nn2poly)
> 
> test_check("nn2poly")
[ FAIL 0 | WARN 1 | SKIP 17 | PASS 69 ]

══ Skipped tests (17) ══════════════════════════════════════════════════════════
• On CRAN (12): 'test-constraints_luz.R:5:3', 'test-nn2poly.R:77:3',
  'test-nn2poly_methods_plot.R:19:3', 'test-nn2poly_methods_plot.R:41:3',
  'test-nn2poly_methods_plot.R:63:3', 'test-nn2poly_methods_plot.R:85:3',
  'test-nn2poly_methods_plot.R:110:3', 'test-nn2poly_methods_plot.R:135:3',
  'test-nn2poly_methods_plot.R:159:3', 'test-parameters.R:58:3',
  'test-plot_diagonal.R:10:3', 'test-plot_diagonal.R:24:3'
• keras cannot be loaded (5): 'test-constraints.R:3:3', 'test-nn2poly.R:58:3',
  'test-parameters.R:2:3', 'test-parameters.R:27:3',
  'test-plot_taylor_and_activation_potentials.R:2:3'

[ FAIL 0 | WARN 1 | SKIP 17 | PASS 69 ]
Warning message:
`teardown()` was deprecated in the 3rd edition.
ℹ Please use test fixtures instead see vignette('test-fixtures') for details 
> 
> proc.time()
   user  system elapsed 
   7.04    1.25   19.17