Testing post-process builders?

[simolus3]

With the recent changes removing the ability to run builders outside of testBuilder, I wonder if there's a way to also test post-process builders?

In particular, I have a sequence of builders generating hidden temporary files that a post-process builder marks as deleted (not that relevant for the codegen use-case, but it's better to mark them as deleted when build runner is also used for JS/WASM compilation later).

In my test, I want to simulate a build that runs all my regular builders followed by the post-process builder. I then want to assert that certain files would be marked as deleted.

Could testBuilders gain the ability to run post-process builders? Then there could be an assetsDeleted getter on TestReaderWriter to inspect that.

[davidmorgan]

Thanks! Yes, this is an omission, sorry about that.

I was already experimenting with expanding what build_test can do, in https://github.com/dart-lang/build/pull/4102/files. Let me take another look.

[davidmorgan]

I think #4187 should do what you need--what do you think, please? :)

[simolus3]

Thanks! I couldn't find that from a quick look at the tests, would I be able to check which asset ids were marked as deleted by post proess builders after calling testBuilders?

[davidmorgan]

Hmm would it be enough to just test that the files have been deleted?

You can check whether the file still exists using the readerWriter that is returned from testBuilders.

[simolus3]

Oh, right 😅 Yeah that works for me, thank you!

[davidmorgan]

Now published--please let me know if there's anything missing that you need :)