R Under development (unstable) (2025-07-28 r88462 ucrt) -- "Unsuffered Consequences"
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> # This file is part of the standard setup for testthat.
> # It is recommended that you do not modify it.
> #
> # Where should you do additional test configuration?
> # Learn more about the roles of various files in:
> # * https://r-pkgs.org/testing-design.html#sec-tests-files-overview
> # * https://testthat.r-lib.org/articles/special-files.html
> 
> library(testthat)
> library(rvif)
Loading required package: multiColl
Loading required package: car
Loading required package: carData
> 
> test_check("rvif")
System is computationally singular. Modify the design matrix before running the code.
System is computationally singular. Modify the design matrix before running the code.
Perfect multicollinearity exists. Modify the design matrix before running the code.
Perfect multicollinearity exists. Modify the design matrix before running the code.
System is computationally singular. Modify the design matrix before running the code.
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 30 ]
> 
> proc.time()
   user  system elapsed 
   0.75    0.17    0.90