use_testthat() sets up testing infrastructure, creating
adding testthat to the suggested packages.
tests/testthat/test-<name>.R and opens it for editing.
use_test(name = NULL, open = TRUE)
Test name. if
NULL, and you're using RStudio, will use the name of the file open in the source editor.
Open the newly created file for editing? Happens in RStudio, if applicable, or via