Only download test data if running the test that needs them (#402)
Only download test data if running the test that needs them (#402)

* Only download test data if running the test that needs them

* Copy test data in the pre-command of the test

gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root