R Under development (unstable) (2023-11-11 r85510 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> 
> test_check("data.tree")
Loading required package: data.tree
                          levelName    cost
1  Acme Inc.                             NA
2   ¦--Accounting                        NA
3   ¦   ¦--New Software             1000000
4   ¦   °--New Accounting Standards  500000
5   ¦--Research                          NA
6   ¦   ¦--New Product Line         2000000
7   ¦   °--New Labs                  750000
8   °--IT                                NA
9       ¦--Outsource                 400000
10      ¦--Go agile                  250000
11      °--Switch to R                50000
  levelName  b             1
1 Root      NA              
2  °--a      2              
3      °--c NA 1, 2, 3, 4, 5
  levelName a
1     Root   
2      °--a 2
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 381 ]
> #devtools::test()
> 
> proc.time()
   user  system elapsed 
   9.51    0.75   10.20