R Under development (unstable) (2024-01-22 r85820 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(igraph)

Attaching package: 'igraph'

The following object is masked from 'package:testthat':

    compare

The following objects are masked from 'package:stats':

    decompose, spectrum

The following object is masked from 'package:base':

    union

> 
> test_check("igraph")
Starting 2 test processes
[ FAIL 0 | WARN 0 | SKIP 38 | PASS 3866 ]

══ Skipped tests (38) ══════════════════════════════════════════════════════════
• On CRAN (36): 'test-vs-es.R:136:3', 'test-vs-es.R:157:3',
  'test-vs-es.R:180:3', 'test-authority.score.R:68:3',
  'test-bug-501-rectangles.R:14:3', 'test-graph.bfs.R:115:3',
  'test-graph.adjacency.R:537:3', 'test-graph.adjacency.R:568:3',
  'test-graph.data.frame.R:49:3', 'test-hrg.R:15:3', 'test-layout.kk.R:2:3',
  'test-make.R:58:3', 'test-make.R:67:3', 'test-make.R:75:3',
  'test-make.R:85:3', 'test-make.R:93:3', 'test-old-data-type.R:94:3',
  'test-par.R:5:3', 'test-par.R:15:3', 'test-plot.R:15:3', 'test-plot.R:38:3',
  'test-print.R:53:3', 'test-rng.R:2:3', 'test-serialize.R:9:3',
  'test-utils-ensure.R:2:3', 'test-versions.R:9:3', 'test-versions.R:19:3',
  'test-versions.R:25:3', 'test-versions.R:40:3', 'test-versions.R:55:3',
  'test-versions.R:72:3', 'test-versions.R:98:3', 'test-vs-es-printing.R:10:3',
  'test-vs-es-printing.R:28:3', 'test-vs-es-printing.R:43:3',
  'test-vs-es-printing.R:59:3'
• nested igraph call handling not implemented yet (1): 'test-graph.bfs.R:99:3'
• pcalg cannot be loaded (1): 'test-adjacency.R:20:3'

[ FAIL 0 | WARN 0 | SKIP 38 | PASS 3866 ]
> 
> proc.time()
   user  system elapsed 
   7.46    0.60   35.34