R Under development (unstable) (2025-01-14 r87574 ucrt) -- "Unsuffered Consequences"
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> 
> if (requireNamespace("tinytest", quietly=TRUE)) {
+ 
+     ## Set a seed to make the test deterministic
+     set.seed(42)
+ 
+     ## R makes us to this (and tinytest now sets it too ...)
+     Sys.setenv("R_TESTS"="")
+ 
+     ## there are several more granular ways to test files in a tinytest directory,
+     ## see its package vignette; tests can also run once the package is installed
+     ## using the same command `test_package(pkgName)`, or by director or file
+     tinytest::test_package("RcppFastFloat")
+ }

test_asdouble2.R..............    0 tests    
test_asdouble2.R..............    0 tests    
test_asdouble2.R..............    0 tests    
test_asdouble2.R..............    1 tests OK 49ms

test_parse.R..................    0 tests    
test_parse.R..................    1 tests OK 
test_parse.R..................    2 tests OK 
test_parse.R..................    3 tests OK 2ms
All ok, 4 results (54ms)
> 
> proc.time()
   user  system elapsed 
   0.25    0.04    0.28