R Under development (unstable) (2023-10-06 r85276 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(grafify)
Loading required package: ggplot2
> library(rlang)

Attaching package: 'rlang'

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

    is_false, is_null, is_true

> library(dplyr)

Attaching package: 'dplyr'

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

    matches

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

    filter, lag

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

    intersect, setdiff, setequal, union

> library(tidyr)

Attaching package: 'tidyr'

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

    matches

> library(lme4)
Loading required package: Matrix

Attaching package: 'Matrix'

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

    expand, pack, unpack

> 
> test_check("grafify")
boundary (singular) fit: see help('isSingular')
boundary (singular) fit: see help('isSingular')
boundary (singular) fit: see help('isSingular')
boundary (singular) fit: see help('isSingular')
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 247 ]
> 
> proc.time()
   user  system elapsed 
   9.93    0.82   10.76