testthat_examples() retrieves path to directory of test files,
testthat_example() retrieves path to a single test file.
testthat_examples()
testthat_example(filename)dir(testthat_examples())
#> [1] "_snaps" "test-failure.R" "test-success.R"
testthat_example("success")
#> [1] "/tmp/RtmpjK6BcS/temp_libpath1a8e426d7265/testthat/examples/test-success.R"