Initial (hacky) version of PDG snapshot testing for analysis/test

[kkysen]

This is an initial (currently quite hacky) version of PDG snapshot testing for analysis/test. Currently it just shells out to ./scripts/pdg.sh and reads the produced (by c2rust-pdg) analysis/test/pdg.log. I intend to improve this a lot (not shell out, but instead invoke library functions in c2rust_pdg and c2rust_dynamic_instrumentation), but I think it's useful to get a working version running so that we are aware of any PDG changes that occur and can unblock anyone else waiting for this to get more aggressive with changes.

Also, the snapshots/*.snap files need to be committed, right?

[oinoom]

Also, the snapshots/*.snap files need to be committed, right?

Yes, I believe so.

[oinoom]

Yay! Great start, this is already a much-needed improvement. I'd love to add this to the pipeline if it's not already there.

[kkysen]

@aneksteind, it'll be added to the CI pipeline once #483 lands, as that adds cargo test to CI. If you want to review that PR, that'd be helpful.

[kkysen]

Also, just a note, if the snapshot tests fail, you can review changes with cargo insta review, otherwise cargo test will keep crashing.

[oinoom]

Also, just a note, if the snapshot tests fail, you can review changes with cargo insta review, otherwise cargo test will keep crashing.

Yep, already making use of this for the new PDG features I'm working on! :)

[kkysen]

Awesome! Yeah, sorry for taking a while. I probably could've implemented this very bare bones version a bit earlier.