Setup code coverage for OpenSearch repo

[dreamer-89]

Is your feature request related to a problem? Please describe

Setup code coverage for OpenSearch repo.

Describe the solution you'd like

As part of this issue, we need to

1. Update existing gradle check script to have -Dtests.coverage=true to generate report on CI server. This step generates the report in .xml format under build/codeCoverageReport directory.
2. Provide mechanism to download/refer generated coverage.xml file on GHA action. This action uploads coverage file on CodeCov server.

Documentation on OpenSearch: https://github.com/opensearch-project/OpenSearch/blob/main/TESTING.md#test-coverage-analysis

Issues on OpenSearch:

1. Upload code coverage report through CI OpenSearch#1320
2. Report test coverage OpenSearch#850

Describe alternatives you've considered

No response

Additional context

No response

[gaiksaya]

Looks like @peterzhuamazon is working on end to end JenkinsFile for gradle check.
@peterzhuamazon can you please update this issue?
Thanks!

[dreamer-89]

@gaiksaya : Thanks for providing the update. Can you please elaborate more on task @peterzhuamazon is working upon. I would like to know more how is it related to the ask on this issue.

[dreamer-89]

Discussed the ask from infra team with @bbarani. Infra team is currently working on public jenkins migration and will help with this issue post existing gradle check migration to public jenkins by end of next week.

CC @anasalkouz @bbarani

[peterzhuamazon]

Since we have completed the migration of gradle check in #851 coverage is on the table now.
Will start now.

[peterzhuamazon]

PR lists:

20220628:

• Add test coverage xml and support 1.x gradle check #2279

20220629:

• Change codecov xml name and move gradle check script to build repo #2283
• Move gradle-check code to its own scripts and upload codecov OpenSearch#3742
• Add gradle cleanup before the checks #2285

20220706:

• Setup branch push coverage and fix coverage uploads OpenSearch#3793

20220707:

• Add handling of push events on gradle check #2315

[peterzhuamazon]

The coverage results are published to codecov, tho it is not showing the analysis correctly.
Need to sync up with @dreamer-89 on what is the next step.
Seems like the xml itself is the issue.

Thanks.

[peterzhuamazon]

It shows:
opensearch-project/OpenSearch#3791 (comment)

[peterzhuamazon]

Codecov now shows:
https://app.codecov.io/gh/opensearch-project/OpenSearch

[peterzhuamazon]

This task is completed for now close the issue.