R Under development (unstable) (2025-09-23 r88869 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 1 | WARN 0 | SKIP 729 | PASS 4734 ]

══ Skipped tests (729) ═════════════════════════════════════════════════════════
• On CRAN (725): 'test-adjacency.R:616:3', 'test-adjacency.R:647:3',
  'test-adjacency.R:790:3', 'test-attributes.R:439:3',
  'test-attributes.R:468:3', 'test-attributes.R:479:3',
  'test-centrality.R:81:5', 'test-centrality.R:137:5',
  'test-centrality.R:145:3', 'test-centrality.R:823:3',
  'test-centrality.R:834:3', 'test-community.R:380:3',
  'test-conversion.R:51:3', 'test-conversion.R:58:3',
  'test-conversion.R:145:3', 'test-conversion.R:200:3',
  'test-conversion.R:567:3', 'test-conversion.R:682:3', 'test-fit.R:31:3',
  'test-flow.R:101:3', 'test-flow.R:145:3', 'test-flow.R:182:3',
  'test-flow.R:195:3', 'test-flow.R:215:3', 'test-flow.R:228:3',
  'test-flow.R:255:3', 'test-flow.R:294:3', 'test-foreign.R:30:3',
  'test-foreign.R:39:3', 'test-foreign.R:48:3', 'test-foreign.R:52:3',
  'test-foreign.R:58:3', 'test-foreign.R:62:3', 'test-games.R:74:3',
  'test-games.R:94:3', 'test-hrg.R:15:3', 'test-hrg.R:21:3', 'test-hrg.R:28:3',
  'test-incidence.R:9:3', 'test-incidence.R:27:3', 'test-incidence.R:121:3',
  'test-incidence.R:139:3', 'test-incidence.R:219:3', 'test-incidence.R:232:3',
  'test-interface.R:183:3', 'test-interface.R:205:3', 'test-iterators.R:334:3',
  'test-iterators.R:355:3', 'test-iterators.R:378:3', 'test-iterators.R:447:3',
  'test-layout.R:20:3', 'test-layout.R:152:3', 'test-layout.R:209:3',
  'test-layout.R:331:3', 'test-make.R:45:3', 'test-make.R:71:3',
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  'test-make.R:106:3', 'test-make.R:270:3',
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  'test-plot.R:197:3', 'test-plot.R:234:3', 'test-plot.R:266:3',
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  'test-print.R:142:3', 'test-structural-properties.R:23:3',
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  'test-aaa-auto.R:3867:3', 'test-aaa-auto.R:3874:3', 'test-aaa-auto.R:3883:3',
  'test-aaa-auto.R:3896:3', 'test-aaa-auto.R:3907:3', 'test-aaa-auto.R:3919:3',
  'test-aaa-auto.R:3930:3', 'test-aaa-auto.R:3936:3', 'test-aaa-auto.R:3945:3',
  'test-aaa-auto.R:3951:3', 'test-aaa-auto.R:3960:3', 'test-aaa-auto.R:3967:3',
  'test-aaa-auto.R:3976:3', 'test-aaa-auto.R:3982:3', 'test-aaa-auto.R:3991:3',
  'test-aaa-auto.R:3998:3', 'test-aaa-auto.R:4008:3', 'test-aaa-auto.R:4020:3',
  'test-aaa-auto.R:4031:3', 'test-aaa-auto.R:4038:3', 'test-aaa-auto.R:4048:3',
  'test-aaa-auto.R:4060:3', 'test-aaa-auto.R:4071:3', 'test-aaa-auto.R:4083:3',
  'test-aaa-auto.R:4093:3', 'test-aaa-auto.R:4106:3', 'test-aaa-auto.R:4117:3',
  'test-aaa-auto.R:4131:3', 'test-aaa-auto.R:4142:3', 'test-aaa-auto.R:4157:3',
  'test-aaa-auto.R:4168:3', 'test-aaa-auto.R:4174:3', 'test-aaa-auto.R:4184:3',
  'test-aaa-auto.R:4190:3', 'test-aaa-auto.R:4199:3', 'test-aaa-auto.R:4206:3',
  'test-aaa-auto.R:4217:3', 'test-aaa-auto.R:4224:3', 'test-aaa-auto.R:4234:3',
  'test-aaa-auto.R:4241:3', 'test-aaa-auto.R:4251:3', 'test-aaa-auto.R:4257:3',
  'test-aaa-auto.R:4268:3', 'test-aaa-auto.R:4275:3', 'test-aaa-auto.R:4284:3',
  'test-aaa-auto.R:4291:3', 'test-aaa-auto.R:4300:3', 'test-aaa-auto.R:4306:3',
  'test-aaa-auto.R:4317:3', 'test-aaa-auto.R:4327:3', 'test-aaa-auto.R:4338:3',
  'test-aaa-auto.R:4345:3', 'test-aaa-auto.R:4354:3', 'test-aaa-auto.R:4361:3',
  'test-aaa-auto.R:4370:3', 'test-aaa-auto.R:4376:3', 'test-aaa-auto.R:4385:3',
  'test-aaa-auto.R:4397:3', 'test-aaa-auto.R:4408:3', 'test-aaa-auto.R:4414:3',
  'test-aaa-auto.R:4423:3', 'test-aaa-auto.R:4429:3', 'test-aaa-auto.R:4438:3',
  'test-aaa-auto.R:4444:3', 'test-aaa-auto.R:4453:3', 'test-aaa-auto.R:4459:3',
  'test-aaa-auto.R:4468:3', 'test-aaa-auto.R:4474:3', 'test-aaa-auto.R:4483:3',
  'test-aaa-auto.R:4489:3', 'test-aaa-auto.R:4499:3', 'test-aaa-auto.R:4505:3',
  'test-aaa-auto.R:4514:3', 'test-aaa-auto.R:4520:3', 'test-aaa-auto.R:4528:3',
  'test-aaa-auto.R:4535:3', 'test-aaa-auto.R:4545:3', 'test-aaa-auto.R:4559:3',
  'test-aaa-auto.R:4572:3', 'test-aaa-auto.R:4586:3', 'test-aaa-auto.R:4598:3',
  'test-aaa-auto.R:4612:3', 'test-aaa-auto.R:4624:3', 'test-aaa-auto.R:4630:3',
  'test-aaa-auto.R:4640:3', 'test-aaa-auto.R:4654:3', 'test-aaa-auto.R:4666:3',
  'test-aaa-auto.R:4680:3', 'test-aaa-auto.R:4692:3', 'test-aaa-auto.R:4706:3',
  'test-aaa-auto.R:4717:3', 'test-aaa-auto.R:4724:3', 'test-aaa-auto.R:4733:3',
  'test-aaa-auto.R:4739:3', 'test-aaa-auto.R:4749:3', 'test-aaa-auto.R:4762:3',
  'test-aaa-auto.R:4771:3', 'test-aaa-auto.R:4778:3', 'test-aaa-auto.R:4787:3',
  'test-aaa-auto.R:4799:3', 'test-aaa-auto.R:4808:3', 'test-aaa-auto.R:4814:3',
  'test-aaa-auto.R:4822:3', 'test-aaa-auto.R:4829:3', 'test-aaa-auto.R:4838:3',
  'test-aaa-auto.R:4849:3', 'test-aaa-auto.R:4858:3', 'test-aaa-auto.R:4869:3',
  'test-aaa-auto.R:4878:3', 'test-aaa-auto.R:4893:3', 'test-aaa-auto.R:4904:3',
  'test-aaa-auto.R:4919:3', 'test-aaa-auto.R:4928:3', 'test-aaa-auto.R:4934:3',
  'test-aaa-auto.R:4943:3', 'test-aaa-auto.R:4957:3', 'test-aaa-auto.R:4965:3',
  'test-aaa-auto.R:4976:3', 'test-aaa-auto.R:4985:3', 'test-aaa-auto.R:4992:3',
  'test-aaa-auto.R:5000:3', 'test-aaa-auto.R:5006:3', 'test-aaa-auto.R:5014:3',
  'test-aaa-auto.R:5020:3', 'test-aaa-auto.R:5028:3', 'test-aaa-auto.R:5034:3',
  'test-aaa-auto.R:5043:3', 'test-aaa-auto.R:5050:3', 'test-aaa-auto.R:5059:3',
  'test-aaa-auto.R:5071:3', 'test-aaa-auto.R:5080:3', 'test-aaa-auto.R:5086:3',
  'test-aaa-auto.R:5095:3', 'test-aaa-auto.R:5101:3', 'test-aaa-auto.R:5110:3',
  'test-aaa-auto.R:5118:3', 'test-aaa-auto.R:5127:3', 'test-aaa-auto.R:5139:3',
  'test-aaa-auto.R:5148:3', 'test-aaa-auto.R:5161:3', 'test-aaa-auto.R:5170:3',
  'test-aaa-auto.R:5177:3', 'test-aaa-auto.R:5186:3', 'test-aaa-auto.R:5193:3',
  'test-aaa-auto.R:5201:3', 'test-aaa-auto.R:5207:3', 'test-aaa-auto.R:5216:3',
  'test-aaa-auto.R:5222:3', 'test-aaa-auto.R:5230:3', 'test-aaa-auto.R:5237:3',
  'test-aaa-auto.R:5246:3', 'test-aaa-auto.R:5252:3', 'test-aaa-auto.R:5261:3',
  'test-aaa-auto.R:5267:3', 'test-aaa-auto.R:5275:3', 'test-aaa-auto.R:5282:3',
  'test-aaa-auto.R:5291:3', 'test-aaa-auto.R:5298:3', 'test-aaa-auto.R:5307:3',
  'test-aaa-auto.R:5313:3', 'test-aaa-auto.R:5334:3', 'test-aaa-auto.R:5340:3',
  'test-aaa-auto.R:5352:3', 'test-aaa-auto.R:5359:3', 'test-aaa-auto.R:5368:3',
  'test-aaa-auto.R:5387:3', 'test-aaa-auto.R:5403:3', 'test-aaa-auto.R:5415:3',
  'test-aaa-auto.R:5426:3', 'test-aaa-auto.R:5446:3', 'test-aaa-auto.R:5463:3',
  'test-aaa-auto.R:5483:3', 'test-aaa-auto.R:5500:3', 'test-aaa-auto.R:5506:3',
  'test-aaa-auto.R:5515:3', 'test-aaa-auto.R:5531:3', 'test-aaa-auto.R:5544:3',
  'test-aaa-auto.R:5550:3'
• nested igraph call handling not implemented yet (1):
  'test-structural-properties.R:174:3'
• {graph} is not installed (2): 'test-conversion.R:527:3',
  'test-conversion.R:555:3'
• {pcalg} is not installed (1): 'test-adjacency.R:20:3'

══ Failed tests ════════════════════════════════════════════════════════════════
── Error ('test-versions.R:131:3'): igraph_version returns a version string ────
Error in `igraph_version("R")`: unused argument ("R")
Backtrace:
    ▆
 1. └─testthat::expect_match(igraph_version("R"), regex) at test-versions.R:131:3
 2.   └─testthat::quasi_label(enquo(object), label, arg = "object")
 3.     └─rlang::eval_bare(expr, quo_get_env(quo))

[ FAIL 1 | WARN 0 | SKIP 729 | PASS 4734 ]
Deleting unused snapshots:
• palette/categorical-palette-5-vertices.svg
• palette/categorical-palette-8-vertices.svg
• palette/diverging-palette.svg
• palette/sequential-palette.svg
• plot.shapes/edge-test-rectangle.svg
• plot.shapes/edge-test-square.svg
• plot.shapes/vertex-shape-crectangle.svg
• plot.shapes/vertex-shape-csquare.svg
• plot.shapes/vertex-shape-none.svg
• plot.shapes/vertex-shape-pie.svg
• plot.shapes/vertex-shape-rectangle.svg
• plot.shapes/vertex-shape-sphere.svg
• plot.shapes/vertex-shape-square.svg
• plot.shapes/vertex-shape-test-shape.svg
• plot.shapes/vertex-shape-vrectangle.svg
• plot/multi-loops-many.svg
• plot/standard-arrow-modes.svg
• plot/standard-arrow-sizes.svg
Error: Test failures
Execution halted