Return the path to one of the packages in the devtools test dir

Devtools comes with some simple packages for testing. This function returns the path to them.

devtest(package)

Arguments

package	Name of the test package.

Examples

if (has_tests()) {
devtest("testUseData")
}
#> [1] "/data/GHE/mpn/deployment/deployments/2020-09-22/renv/library/R-3.6/x86_64-pc-linux-gnu/devtools/tests/testthat/testUseData"