R Under development (unstable) (2023-11-26 r85638 ucrt) -- "Unsuffered Consequences"
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> if (requireNamespace("tinytest", quietly = TRUE)) {
+   tinytest::test_package("tanaka")
+ }

test_tanaka.R.................    0 tests    
test_tanaka.R.................    0 tests    
test_tanaka.R.................    1 tests OK 
test_tanaka.R.................    2 tests OK 
test_tanaka.R.................    3 tests OK 
test_tanaka.R.................    4 tests OK 
test_tanaka.R.................    5 tests OK 
test_tanaka.R.................    6 tests OK 
test_tanaka.R.................    7 tests OK 
test_tanaka.R.................    8 tests OK 1.6s
All ok, 8 results (1.7s)
> 
> proc.time()
   user  system elapsed 
   5.12    0.25    5.34