add coverage-path and coverage-ignore-path in test_runner coverage.

[pulkit-30]

What is the problem this feature will solve?

coverage-path: to specify the path from which the coverage summary should be collected. and
coverage-ignore-path: to specify the files and directories that should be ignored while collecting coverage.

these can be two cli flags also, passed along with --test-coverage flag.
something like this:

node --test --experimental-test-coverage --coverage-path='./src/**' --coverage-ignore='./src/utils/**' index.test.mjs

What is the feature you are proposing to solve the problem?

currently, there is no way to include or exclude a file or directory from test coverage.

What alternatives have you considered?

No response

[juanarbol]

That's needs to be supported in V8

https://bugs.chromium.org/p/v8/issues/detail?id=12702&q=&start=300; I've proposed two patches for it, still work in progress

[sebiniemann]

I'm uncertain whether this was intended in the original post and if it would be addressed by the chromium ticket.

To evaluate the coverage at the project level, it might be beneficial if the --coverage-path is interpreted such that files without any coverage (files that were unseen by v8) are included in the report with 0% coverage. Minus the files specified via --coverage-ignore.

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[avivkeller]

FWIW this is implemented with globs in #53553