ci: Add some developer and testing documentation #8757
Draft
+1,353
−69
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
We generate the coverage report from running the tests, and gathering coverage via the llvm instrumentation. The difficulty is in makeing sure that the profraw files do not clobber each other and that partially written profraw files do not cause the aggregation to fail.
In additiona, since we generate ~10GiB of profraw files, we needed to filter and process them in chunks.
Since we were at it I added a python API documentation step, so hopefully we will have a better idea of what testing primitives we have at our disposal for example.