Add unit test utilities for locating dependency files.
Review Request #11647 — Created June 7, 2021 and submitted
We'll have some unit tests that depend on locally-placed files (in
.jarfiles). To keep this manageable, there's now a
tests/deps/directory that unit tests can use for looking up placed
files, and a
get_test_dep_path()method to aid in that.
No tests use this yet, but that will be changing with all Java-backed
tests shortly, to avoid a dependency (and issues with)
Used this in some upcoming unit tests successfully.