R Under development (unstable) (2025-07-27 r88459 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(invertiforms)
Loading required package: Matrix

Attaching package: 'invertiforms'

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

    transform

> 
> test_check("invertiforms")

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

This graph was created by an old(er) igraph version.
ℹ Call `igraph::upgrade_graph()` on it to use with the current igraph version.
For now we convert it on the fly...
This graph was created by an old(er) igraph version.
ℹ Call `igraph::upgrade_graph()` on it to use with the current igraph version.
For now we convert it on the fly...
This graph was created by an old(er) igraph version.
ℹ Call `igraph::upgrade_graph()` on it to use with the current igraph version.
For now we convert it on the fly...
This graph was created by an old(er) igraph version.
ℹ Call `igraph::upgrade_graph()` on it to use with the current igraph version.
For now we convert it on the fly...
[ FAIL 0 | WARN 1 | SKIP 1 | PASS 7 ]

══ Skipped tests (1) ═══════════════════════════════════════════════════════════
• Not yet implemented. (1): 'test-PerturbedLaplacian.R:23:3'

[ FAIL 0 | WARN 1 | SKIP 1 | PASS 7 ]
> 
> proc.time()
   user  system elapsed 
   1.45    0.21    1.67