Support outputFile option for listTests option

[manoraj]

Summary

Added to Feature Proposal as well -> #14943

🚀 Feature Proposal
Right now, the --listTests option will just write the list of tests to the console. My proposal is to use the --outputFile option along with the --listTests option to write the output to the file.

Motivation
We wanted to use the list of tests in the custom sequencers. This feature will help to store the list in the file so that the sequencers can access it.

Note that this is just my usecase. There may be different use cases as well.

Example
Pass --outputFile=test-lists.json along with --listTests

yarn test --listTests --json --outputFile=test-lists.json

[linux-foundation-easycla]

• ✅ login: manoraj / name: Manoraj K (3493ace, 29dc655, 04f2cc9)
• ✅ login: SimenB / name: Simen Bekkhus (1cd4dbd, bb4bb87, 13b15e5, 74ad243, 5e61b72)
• ❌ - login: @mkenchugonde . The commit (3d0a90d, d4841c1, e004aac, 9b3939d, fe67e6d) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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[SimenB]

works for me, thanks!

Could you add a changelog entry and an integration test?

[SimenB]

Thanks! All that's missing is @mkenchugonde signing the CLA 🙂

[SimenB]

@mkenchugonde hello! 👋 could you sign the CLA? 🙂

[manoraj]

@mkenchugonde hello! 👋 could you sign the CLA? 🙂

I am not sure how I ended up pushing commits from @mkenchugonde ( I intend to use my personal account @manoraj ). I have signed the CLA from @mkenchugonde, but it needs approval from the organization I guess. I will wait for one or two days before seeking help for next steps.

[SimenB]

If it's all you, you should be able to just rebase and change author or squash the commits

[manoraj]

If it's all you, you should be able to just rebase and change author or squash the commits

@SimenB Have created new PR -> #14980. Will close this PR once you acknowledge.

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