setup_test_dir: Take care or finding the test files and sourcing the helpers.
Description
Take care or finding the test files and sourcing the helpers.
Usage
setup_test_dir(path, filter, env)
Arguments
path
path to tests
filter
If not NULL, only tests with file names matching this
regular expression will be executed. Matching will take on the file
name after it has been stripped of "test-" and ".r".